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# How many neutrons does argon have

How Many Neutrons Does Argon Have? Hello, chemistry lover! today we are going to help you to find out how many neutrons argon have in just 3 steps. To find out the number of neutrons for argon,we have to have knowledge about atomic number,atomic mass,mass number of argon. Step-1: The atomic number of argon is the number of protons in argon's nucleus On the Earth, 40 Ar makes up 99.6% of natural argon. Argon-36 is composed of 18 protons, 18 neutrons, and 18 electrons. Argon-38 is composed of 18 protons, 20 neutrons, and 18 electrons. Argon-40 is composed of 18 protons, 22 neutrons, and 18 electrons How many electrons does argon have. Argon-38 is composed of 18 protons 20 neutrons and 18 electrons. The longest-lived radioactive isotopes are 39 Ar with a half-life of 269 years 42 Ar with a half-life of 329 years and 37 Ar with a half-life of 3504 days 22. The atom of Argon has 22 neutrons. Thanks ☺️☺️. acobdarfq and 12 more users found this answer helpful. heart outlined. Thanks 9. star. star. star Argon has 18 protons and 22 neutrons in the nucleus. It has 18 electrons surrounding the nucleus with 2, 8 and 8 electrons in the three shells. What are some subatomic particles of argon? Argon has..

Since argon argon 's atomic number is 18 18, Ar Ar has 18 18 protons. 18 18 protons Fill in the known values where N N represents the number of neutrons. 40 = 18+ N 40 = 18 + How many neutrons does argon have. This means that some Argon atoms have 18 neutrons some 20 neutrons and some 22 neutrons the isotope with 22 neutrons is the most common and forms 996 of all Argon. Unfortunately I do not have the information about neutrons. Argon is the third-most abundant gas in the Earths atmosphere at 0934 9340 ppmv

Argon can have any number of neutrons, being defined as an element only by the number of protons in the nucleus. Observed nuclides of argon having some bound character possess between 13 and 33 neutrons. Argon's stable and naturally-occurring isotopes have 18, 20, or 22 neutrons Name: Argon: Symbol: Ar: Atomic Number: 18: Atomic Mass: 39.948 atomic mass units: Number of Protons: 18: Number of Neutrons: 22: Number of Electrons: 18: Melting. Argon is an element with atomic number 18. On the periodic table, it is placed in a corner (where most introverts argon has a full outer orbital. What is argon (element 18), is it a solid, liquid, or gas, what is its symbol, molar mass, how many electrons, protons, neutrons does it have, its fun facts. The element symbol for argon used to be a

How many protons, neutrons and electrons does Argon have? 18 protons, 18 electrons, 40-18=22 neutrons If an element has 83 protons, what is its atomic number and which element is it? Atomic number 83 and its identity is Bismut How many neutrons does this atom of argon have? The atom of Argon has 22 neutrons. relationships play a major role in a human's emotional and mental wellbeing. healthy relationships with the people around you are even linked to a smaller production of cortisol, a stress hormone. That would be a working theory Chemistry, 15.12.2020 23:40, bighenry2 How many neutrons does Argon 41 hav How many protons neutrons and electrons does argon have? This means that some Argon atoms have 18 neutrons, some 20 neutrons and some 22 neutrons the isotope with 22 neutrons is the most common and forms 99.6% of all Argon. Atomic number is the number of protons. is argon used in light bulbs

### How Many Neutrons Does Argon HaveNumber of Neutrons in Argo

• Argon-38 Information. Argon is a monatomic noble gas. It makes up 0.93% of the air. Argon is a colourless, odorless element. It is inert and has no true compounds. Lord Rayleigh and Sir William Ramsey identified argon in 1894. Argon has 26 isotopes, 3 of them are stable and naturally occurring. Argon is used in lighting products
• In this video we'll use the Periodic table and a few simple rules to find the protons, electrons, and neutrons for the element Argon (Ar). From the Periodi..
• Question From - NCERT Chemistry Class 9 Chapter C04 Question - 008 STRUCTURE OF THE ATOM CBSE, RBSE, UP, MP, BIHAR BOARD QUESTION TEXT:- Helium atom has an a..
• Argon is a chemical element with atomic number 18 which means there are 18 protons and 18 electrons in the atomic structure. The chemical symbol for Argon is Ar. Argon is the third-most abundant gas in the Earth's atmosphere, at 0.934% (9340 ppmv)

### Argon - Protons - Neutrons - Electrons - Electron

• Neutrons do not have a net electric charge, so the number of neutrons does not matter in the calculation. The number of protons of an atom cannot change via any chemical reaction, so you add or subtract electrons to get the correct charge. If an ion has a 2+ charge, like Zn 2+, this means there are two more protons than electrons
• Argon (18 Ar) has 26 known isotopes, from 29 Ar to 54 Ar and 1 isomer (32m Ar), of which three are stable (36 Ar, 38 Ar, and 40 Ar). On the Earth, 40 Ar makes up 99.6% of natural argon. The longest-lived radioactive isotopes are 39 Ar with a half-life of 269 years, 42 Ar with a half-life of 32.9 years, and 37 Ar with a half-life of 35.04 days. All other isotopes have half-lives of less than.
• 18 protons, 18 electrons, and 22 neutrons. In the form of an element, _Z^YX, Z is the number of protons, and also the number of electrons, and Y is the atomic mass. So, in the case of _18^40Ar, then it has 18 protons and 18 electrons. The number of neutrons is given by subtracting the atomic mass from the proton number
• Hence argon-39 atom has 18 protons. Since its mass number is 39 , hence argon-39 has (39-18)= 21 neutrons. We know that a neutral atom has same number.
• How many protons, neutrons, and electrons does a chromium atom have with a charge of +3? Subatomic Particles Subatomic particles are the particles that compose an atom
• How many neutrons in Cadmium? 64 . MOVE AHEAD 3 SPACES . What is the charge of a proton? Positive . Does not have a group . MOVE AHEAD 3 SPACES . Name one element in the same group as Actinium (atomic Neon, Argon, Krypton, Radon . MOVE AHEAD 3 SPACES . Name one element that has similar characteristics as hydrogen
• e the number of Protons, neutrons, the Atomic Mass, Atomic Number, number . A bohr model of gallium should have four rings not including thenucleus with 31 protons and 39 neutrons in the nucleus and in thefour rings you should have a total of 31 elect rons. In the

### How Many Neutrons Does Argon Have - ViralListClub

• What common compounds does Argon form? anon252703 March 6, 2012 . How many neutrons and electrons does argon have? anon138682 6 hours ago . in what field does argon belong? anon112516 September 20, 2010 . is argon used in light bulbs? Please answer me asap! anon110827 September 13, 201
• What has 18 protons and 22 neutrons? Name Argon. What has 9 protons and 9 Neutrons? Fluorine. How many electrons are in fluorine 21? So for the element of FLUORINE, you already know that the atomic number tells you the number of electrons. That means there are 9 electrons in a fluorine atom
• Sulfur has 16 protons, 16 neutrons and 16 electrons: 17: Chlorine has 17 protons, 17 neutrons and 17 electrons: 18: Argon has 18 protons, 22 neutrons and 18 electrons: 19: Potassium has 19 protons, 20 neutrons and 19 electrons: 20: Calcium has 20 protons, 20 neutrons and 20 electrons: 21: Scandium has 21 protons, 24 neutrons and 21 electrons: 2
• These neutrons have an energy -- about 2.5 million electron volts -- that is ideal for irradiating rocks to conduct argon-argon dating, one of the most precise methods in use today

« Konkurs ŻYWY OBRAZ how many neutrons does argon have There are 21.948 neutrons in Argon. How many neutrons are there in Argon? There are 18 electrons in Argon. How many electrons are in Argon? There are 18 protons and 21.948 neutrons. How many protons and neutrons are in the nucleus of an atom of Argon? Argon is clear and it weighs 39.948 AMU. Name some physical properties of Argon The identity of a chemical element depends on the number of protons an atom has in its nucleus which is known as atomic number. Any atom that has 19 protons in its nucleus will be an atom of argon. mass number=A=Z+no. of neutrons no. of neutrons=A−Z=40−18=22. The average atomic mass of the element argon will b The number of electrons in a neutral atom (as opposed to an ion) is given by the atomic number on the AZE system - in this case the red number 13. Therefore this aluminium atom has 13 electrons. Q113-03 How many neutrons are present in the atom. Answer. Argon has a mass number of 40 as shown by the blue number

14 Neutrons in its nucleus. Silicon. 2 Protons in its nucleus. Helium. 8 More protons than boron. Aluminum 13 Electrons surrounding its nucleus. Aluminum 7 more protons than sodium. Argon. 3 fewer electrons than nitrogen. Beryllium. 12 electrons surrounding its nucleus. Magnesium. 10 electrons surrounding its nucleus . Neon . 16 neutrons in its. Argon has a mass of 40. How many neutrons does it have? 22: Boron has a mass of 11. How many neutrons does it have? 6: What subatomic particle determines an atom's identity? Protons: In a neutral atom, the number of protons is ___ to electrons: equal: Where are protons and neutrons found in an atom Atoms, either singly as elements or in groups of molecules, make up all matter. Does Ca2 have the same number of electrons as the noble gas argon? Building on the work of many scientists, Dmitri Mendeleev organized the Periodic Table based on atomic mass. It will then have the electron configuration of Argon, a noble gas. So it becomes S2- ion Follow Us: Argon has eight valence electrons. Its electron configuration is 1s2 2s2p6 3s2p6, so it has three filled electron shells of 2, 8 and 8. The atomic number of argon is 18. Argon was discovered by Sir William Ramsay in 1894. It is a nonmetal and a gas at room temperature How many neutrons does Phosphorous (P) have? answer choices . 15. 30. 31. 16. Tags: Question 25 . SURVEY . 30 seconds . Q. How many protons does Boron (B) have? SURVEY . 30 seconds . Q. How many electrons does Argon (Ar) have? answer choices . 40. 39. 18. 22. Tags: Question 27 . SURVEY . 30 seconds . Q. How many neutrons does Rubidium (Rb.

How many protons, neutrons, and electrons are contained in an atom of argon, which has an atomic. number of 18 and a mass number of 40? check_circle How many shells/orbits are present in L? (a) 4 (b) 5 (C) 6 23. How many protons are present in Hydrogen? (a) 1 (b) 1.008 (C) 2 (do 24. How many neutrons are present in Fluorine? (b) 7 (C) 18 (a) 9 (d) 19 25. Show in diagram where electrons . protons, neutrons and nucleus are present in an atom? Label? 26. Draw structure of atom showing how many. When full, the innermost electron shell of argon contains how many electrons, and the outermost shell contains how many electrons? What is unique about each element of the periodic table? The sodium atom contains 11 electrons, 11 protons, and 12 neutrons All other elements have neutrons as well as protons in their nucleus, such as helium, which is depicted in Figure 2.2. The positively charged protons tend to repel each other, and the neutrons help to hold the nucleus together. The number of protons is the atomic number, and the number of protons plus neutrons is the atomic mass. For hydrogen. The atomic number is the number of protons in the nuclei of the atoms of an element. A neutral atom has the same number of electrons as protons. We can look at period 2 as an example. How many core electrons does K 19 have? thus core electron = 19 - 1 = 18

argon-40, calcium-40 strontium-87 nitrogen-14 4,460 million years 1,260 million years 48800 million years 5,715 years Applying Math 3. Apply The element uranium has a mass number of 238, and an atomic number of 92. How many neutrons does an atom of uranium have? How is the number of neutrons found? If you know the mass number and atomic number. Chem4Kids.com: Argon: Orbital and Bonding Info. Check out the blackboard. That box on the left has all of the information you need to know about one element. It tells you the mass of one atom, how many pieces are inside, and where it should be placed on the periodic table . In the next section we're going to cover electron orbitals or electron.

### how many neutrons does this atom of argon have? - Brainly

1 Answer. Calcium atoms will lose two electrons in order to achieve the noble gas configuration of argon. A neutral calcium atom has 20 electrons, while a calcium atom that has lost two electrons will have 18 electrons, and a neutral argon atom also has 18 electrons. electron configuration of 1s22s22p63s23p64s2 Most hydrogen atoms have a nucleus with only a single proton. About 1 in 10,000 hydrogen nuclei, however, also has a neutron; this particular isotope is called deuterium. An extremely rare hydrogen isotope, tritium, has 1 proton and 2 neutrons in its nucleus. Figure 2.5. 1 compares the three isotopes of hydrogen Atomic Mass and Isotopes • Atomic mass is the average mass number for all isotopes of an element • Isotopes are different versions of the same element due to different masses - Isotopes must differ in their number of neutrons - Example. • 99% of carbon exists as carbon-12, with 6 protons and neutrons • Less abundant carbon isotopes. Argon with 21 neutrons. Zinc with 34 neutrons. Fill in the blanks. Element Protons Neutrons Electrons Mass number Complete symbol Cu 65 Kr 86 78 117 46 35 5. Fill in the blanks. X Z A neutrons Complete symbol 60 114 Mg 12 64 94 Cl 37 Chapter 2 Exercises' Answer Key.

Answer to: How many neutrons does copper (Cu) have? By signing up, you'll get thousands of step-by-step solutions to your homework questions. You.. To find the number of neutrons, you will need to subtract the atomic number from the atomic mass. Remember that the atomic number is the same as the number of protons, which you have already identified. For our boron example, 11 (atomic mass) - 5 (atomic number) = 6 neutrons And since the atom is neutral, the number of electrons and protons are equal. For Kr, you have to look for its atomic number from the Periodic Table. From the periodic table, the atomic number of Kr is 36. Therefore to get the number of neutrons, you must subtract the atomic number (36) from the mass number ( 84)

### Find the Number of Neutrons Ar Mathwa

1. Iron has an atomic number of 26. That means iron has 26 protons and 26 electrons. With those numbers, the atom is neutral. In order to know how many neutrons are in an atom, you must know the mass.
2. The first one has been completed for you. SYMBOL ATOMIC NUMBER ATOMIC MASS (amu) NUMBER OF PROTONS NUMBER OF NEUTRONS NUMBER OF ELECTRONS CHARGE 6 12 6 6 6 0 40 18 Ar 18 40 18 22 18 0 127 -1 53 I 53 127 52 74 53 -1 11 23 12 12 11 +1 48 22 Ti 22 48 22 26 22 0 238 92 U 92 238 92 146 92 0 How many electrons surround the nucleus of an atom of.
3. An important series of isotopes is found with hydrogen atoms. Most hydrogen atoms have a nucleus with only a single proton. About 1 in 10,000 hydrogen nuclei, however, also has a neutron; this particular isotope is called deuterium. An extremely rare hydrogen isotope, tritium, has 1 proton and 2 neutrons in its nucleus. Figure 2.6 compares the.
4. So for your question, the Periodic Table tells us that potassium has an Atomic Number of 19, so there are 19 protons and 19 electrons. The Periodic Table tells us that potassium has an Atomic Mass of ≈39. So there are 39 - 19 = 20 neutrons. Protons and electrons can be combined into neutrons

How many photons per second does this laser produce? (Q4B.5 from textbook) A certain argon laser produces about 5 mW of light at a wavelength of 514 nm. (Q4B.10 from textbook) Suppose red and green light-emitting diodes (LEDs) radiate the same amount of power in the form of light at wavelengths of 650 nm and 560 nm, respectively Isotopes are varieties of an element that have the same number of protons but a different number of neutrons within the nucleus. For example, carbon-14 (14 C) is a particular isotope. All carbon atoms have 6 protons but can vary in the number of neutrons. 12 C has 6 protons and 6 neutrons in its nucleus. 13 C has 6 protons and 7 neutrons

How Many Neutrons Does Description Rubidium(Rb) Have? Hello, chemistry lover! today we are going to help you to find out how many neutrons rubidium (Rb) have in just 3 steps. Descriptio To find out the number of neutrons for rubidium (Rb) ,we have to have knowledge about atomic number,atomic mass,mass number of rubidium (Rb D) Electron Cloud. E) Dalton's Model. 22. Which of the following is still true today? A) electrons orbit totally randomly around the nucleus. B) atoms are tiny solid spheres. C) the atom is a positively charged sphere with electrons embedded in it. D) the atom is mostly empty space. 23 Similarly, you may ask, how many protons and electrons are in a nitrogen atom? 2,5 . How many electrons does nitrogen 20 have? The most common form of nitrogen has 7 neutrons, which makes up 99% of the nitrogen atoms on earth, although nitrogen atoms with 8 neutrons can also be found. A neutral nitrogen atom will also have 7 electrons To discover the amount of protons and neutrons in boron-11, one must look at its atomic number and atomic mass. Boron-11's atomic number is five, which means it always has five protons. To discover how many electrons boron-11 has, one should subtract the amount of known protons from its atomic mass of 11. The remainder, six, represents the. Accordingly, how many electrons does neon have? 2,8. How many neutrons and electrons does neon have? Neon is an atom with atomic number ten. Its atomic weight is 20.179 which cause it to have ten neutrons and ten protons in its nucleus and ten electrons outside

sulfur-33 has how many neutrons does carbon. In nature, sulfur can be found in hot springs, meteorites, volcanoes, and as galena, gypsum, and epsom salts. Protons and neutrons make up the mass of atoms. Very rarely, helium forms the isotope helium-3, which still has 2 protons but has a mass number of 3 how many neutrons does thorium have Home; Contac Name: Argon Symbol: Ar Atomic Number: 18 Atomic Mass: 39.948 amu Melting Point:-189.3 °C (83.85 K, -308.74 °F) Boiling Point:-186.0 °C (87.15 K, -302.8 °F) Number of Protons/Electrons: 18 Number of Neutrons: 22 Classification: Noble Gas Crystal Structure: Cubic Density @ 293 K: 1.784 g/cm 3 Color: Colorless Gas Atomic Structur

Atomic Number of Argon. Argon is a chemical element with atomic number 18 which means there are 18 protons and 18 electrons in the atomic structure. The chemical symbol for Argon is Ar.. Atomic Mass of Argon. Atomic mass of Argon is 39.948 u. Note that, each element may contain more isotopes, therefore this resulting atomic mass is calculated from naturally-occuring isotopes and their abundance Solution for Argon has three naturally occurring isotopes, 36Ar, 38Ar, and 40Ar. What is the mass number of each? How many protons, neutrons, and electrons ar

How many protons and neutrons are in an atom of Argon? 3 Li Lithium 6.94 1 H Hydrogen 1.01 14 Si Silicon 28.09 18 Ar Argon 39.95 The answers are What is the atomic number for lithium? How many protons does an atom of Si have? What is the atomic mass for Argon? How many electrons does an atom of H have? How many neutrons are in an atom of Li. But argon does have an interesting story to tell astronomers and geologists. Argon constitutes 1.3 percent of earth's atmosphere by weight and 0.94 percent by volume

Argon has 18 protons and is a neutral atom, so it also has 18 electrons. What is the atomic number for an ion that has a charge of +3 and contains 18 electrons? The atomic number is 21, which means that scandium has 21 protons. While a neutral atom for scandium would have the same number of electrons as protons, the ion is shown to have a +3. So, sodium contains 11 protons and its mass number is 23. Applying the formula above, the number of neutrons will be: # number of neutrons = Mass Number - Number of Protons. # number of neutrons. For example, 99% of the carbon atoms on Earth have 6 neutrons and 6 protons in their nuclei; about 1% of the carbon atoms have 7 neutrons in their nuclei. Naturally occurring carbon on Earth, therefore, is actually a mixture of isotopes, albeit a mixture that is 99% carbon with 6 neutrons in each nucleus However, it was found that atoms of the same element can have different numbers of neutrons. Atoms of the same element that have different numbers of neutrons are called isotopes. For example, 99% of the carbon atoms on Earth have 6 neutrons and 6 protons in their nuclei; about 1% of the carbon atoms have 7 neutrons in their nuclei How many of each? Express your answers as percents. Part 2: The Number of Neutrons 1. Complete the table. 2. How many isotopes does argon have? 3. Which isotope of argon must be most common? Explain your reasoning. 4. If you somehow managed to isolate a single atom of lithium, how many neutrons would it probably have in its nucleus? Explain. 5

### How Many Neutrons Does Argon Have - Smar

On February 29, 2014, a Modesto Junior College chemistry class will discover a new element, Modestonium (Mm) with atomic number 124. The element will have a colorful electron shell and a tasty nucleus. Mass spectrometric analysis will reveal that the element consists of 80.00% 314.0Mm and 20.00% 312.0Mm Facts Date of Discovery: 1917 Discoverer: Fredrich Soddy Name Origin: From the Greek word protos (first) Uses: No uses known Obtained From: fission product of uranium, thorium, plutonium Related Links I currently do not know of any links for Protactinium. If you do, please let me know MLA Format for Citing This Pag Helium, neon and argon ? Lithium, calcium and sulfur ? Lithium, boron and fluorine ? Hydrogen, fluorine and chlorine If its atomic number is 6, how many protons and neutrons does it have? ? 6 protons and 8 neutrons ? 8 protons and 6 neutrons ? 6 protons and 6 neutrons ? 6 protons and 14 neutrons. To find the number of neutrons, you will need to subtract the atomic number from the atomic mass. Remember that the atomic number is the same as the number of protons, which you have already identified. For our boron example, 11 (atomic mass) - 5 (atomic number) = 6 neutrons Group 18 elements (helium, neon, and argon are shown in Figure 5) have a full outer, or valence, shell. A full valence shell is the most stable electron configuration. Elements in other groups have partially filled valence shells and gain or lose electrons to achieve a stable electron configuration

### How to know how many neutrons argon has - Quor

List six non-metals by name and symbol. How many protons and electrons do these non-metals have? Name of Non-Metal Symbol p e- helium He 2 2 radon Rn 86 86 chlorine Cl 17 17 oxygen O 8 8 nitrogen N 7 7 carbon C 6 6 and many others. These are located to the right of the staircase. 4. How many protons, neutrons, and electrons are present in I-131 Before you start, take a look at carbon on the periodic table. It has an atomic number of 6. That means a carbon atom has 6 protons, 6 neutrons, and 6 electrons. Since carbon is in the second row (or second period), it has 2 electron orbits. Use the clay to make your protons and neutrons in the nucleus For example, the mass number of argon atoms and calcium atoms can both be 40. Calculate the number of protons, neutrons and electrons it contains. Reveal answer What is thename of element that has present in an argon atom? atoms that contain 92 protons? 4. How many protons and electrons are 11. 15. Write the chemical symbol for the ion with 21. How many protons, neutrons, and 29 protons and 27 electrons, electrons are present in the n4 ion? 16. How many protons, neutrons, and 22. Write the complete.

### #18 - Argon - A

Argon has three naturally occurring isotopes: argon­36, argon­38, and argon­40. How many neutrons do these isotopes have? _____ 6. For each of the following isotopes indicate the number of protons, neutrons and electrons that it has: Pb­210 #protons #neutrons #electrons 239Pu 94. 8. 9. Title: Untitled Subject: SMART Board Interactive. a) How many neutrons does this element have? Write the number as your answer. b) True or false. This element is fluorine c) True or false. The atomic mass tells us how many protons it has in its nucleus. d) True or false. It has 9 protons in its nucleus 2. Which of the following (A - D) is CORRECT regarding the picture

### Argon Element : 10 Argon Facts - Ar or Atomic Number 1

Hydrogen-5 is a highly unstable isotope of hydrogen. It has been incorporated in the laboratory by bombarding tritium with fast-moving tritium nuclei. Hydrogen-6. It has a half-life of 290 yoctoseconds. It decays through triple neutron emission into hydrogen-3. Hydrogen-7. It comprises 6 neutrons and 1 proton. It has a half-life of 23 yoctoseconds Question 30. SURVEY. 120 seconds. Q. As the period number increases on the periodic table (moving from the top of the table to the bottom), answer choices. the number of the energy level containing the valence electrons increases. the number of the energy level containing the valence electrons decreases An atom of argon is ionised by the removal of two orbiting electrons. (a) How many protons and neutrons are there in this ion? (2) (b) What is the charge, in C, of this ion? (2) (c) Which constituent particle of this ion has: (i) a zero charge per unit mass ratio, (ii) the largest charge per unit mass ratio? (2 The number of neutrons in this isotope of sodium is A) 11. B) 14. C) 16. D) 25. E) 32. Answer: B 27) Which of the following gives the correct numbers of protons, neutrons, and electrons in 118 a neutral atom of Sn? 50 SS S A) 1 18 protons, 50 neutrons, 118 electrons B) 118 protons, 118 neutrons, 50 electrons C) 50 protons, 68 neutrons, 50 electron You also have potassium-- and once again writing the K and the 19 are a little bit redundant-- you also have potassium-41. So this would have 22 neutrons. 22 plus 19 is 41. This accounts for about 6.7% of the potassium on the planet. And then you have a very scarce isotope of potassium called potassium-40. Potassium-40 clearly has 21 neutrons

Not all the atoms of an element need have the same number of neutrons in their nuclei. In fact, it is precisely the variation in the number of neutrons in the nuclei of atoms that gives rise to isotopes. Hydrogen is a case in point. It has the atomic number 1. Three nuclei with one proton are known that contain 0, 1, and 2 neutrons, respectively Answer: Charge = 1.60 x 10 -19 C (one unit negative charge) Mass = 9.11 x 10 -31 kg (1/1840th of the mass of hydrogen atom). Question 14. Compare the radius of the nucleus with that of the atom. Answer: Radius of the atom is of the order of 10 -10 m while that of the nucleus is of the order of 10 -15 m Potassium-40 (40 K) is a radioactive isotope of potassium which has a long half-life of 1.251 × 10 9 years. It makes up 0.012% (120 ppm) of the total amount of potassium found in nature.. Potassium-40 is a rare example of an isotope that undergoes both types of beta decay.In about 89.28% of events, it decays to calcium-40 (40 Ca) with emission of a beta particle (β −, an electron) with a. Atomic Number: In chemistry and physics, the atomic number (also known as the proton number) is the number of protons found in the nucleus of an atom and therefore identical to the charge number of the nucleus. Wikipedia. Electron: A stable subatomic particle in the lepton family having a rest mass of 9.1066 × 10-28 grams and a unit negative electric charge of approximately 1.602 × 10-19.