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Topic 3 - The Atomic Structure

9. Isotope symbols: Determining number of particles from isotope symbols
1. What is the mass number of P ?
31
15

1) 31 2) 15 3) 16 4) 46

40
2. What is the total number of protons in the nucleus of the symbol Ar ?

18

1) 40 2) 12 3) 58 4) 18

227
3. What will be the total number of protons and neutrons in the nucleus of X ?
91

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1) 91 2) 136 3) 227 4) 318

4. What is the total number of nucleons in the nuclide Zn?
65

30
1) 65 2) 30 3) 35 4) 95

21
5. The atom of Ne has a nuclear charge of
10

1) +21 2) +10 3) +11 4) +31

6. The number of electrons in the neutral atom of O is
15
8
1) 7 2) 15 3) 8 4) 23

7. How many neutrons can be found in the neutral atom of Mg-26? 4) 38

3) 26
1) 12
2) 14

8. What is the mass number of sodium – 23 ?
1) 23 2) 11 3) 12 4) 34

9. What is the total number of neutrons in an atom of Pb - 207 ? 4) 289

2) 125

3) 207
1) 82

10. Which information is correct for the nuclide X ?
34
16
1) It has 16 protons, 15 electron, and 16 neutron
2) It has 16 protons, 15 electrons and 16 neutrons
3) It has 16 protons, 16 electrons, and 34 neutrons
4) It has 16 protons, 16 electrons, and 18 neutrons

11. Which is true of the isotope symbol Be ?
9
4
1) It has 4 protons, 4 electrons, and 9 neutrons
2) It has 9 protons , 9 electrons, and 4 neutrons
3) It has 4 protons, 4 electrons, and 5 neutrons

4) It has 9 protons, 4 electrons, and 5 neutrons

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