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Topic 3 - The Atomic Structure
10. Continues
14
14
5. The nuclides C and N are similar in that they both have the same
1) Mass number 2) Atomic Number 3) Number of neutrons 4)Nuclear charge
6. Which pair of atoms do the nuclei contain the same number of neutrons?
1) 7 Li and Be 2) K and K 3) Ca and Ar 4) N and O
40
42
41
40
14
16
9
3 4 19 19 20 18 7 8
7. In which pair do the atoms have the same number of neutrons?
1) 24 Mg and Na 2) N and O 3) Si and P 4) S and S
16
15
24
33
32
31
32
8. Which two isotopes contain the same number of neutrons? 4) H-3 and He-4
Teacher Preview Copy
Teacher Preview Copy
1) H-1 and He-3
3) H-3 and He-3
2) H-2 and He-4
9. In which pair of atoms do the nuclei contain the same number of neutrons?
1) Calcium-40 and Calcium-42
3) Bromine – 83 and Krypton - 83
2) Chlorine-35 and Sulfur- 34 4) Iodine – 127 and Bromine – 80
10. Which pair of atom does the nuclide contains the same number of nucleons?
1) 121 Sn and 119 Sn 2) O and F 3) 222 Ra and 222 Rn 4) 226 Ra and 228 Ra
1 9
20
50 50 8 9 88 86 88
88
11. Which isotope contains the greatest nuclear charge? 40 40
42
37
1) Cl 2) K 3) Ar 4) Ca
12. Which symbol has the smallest nuclear charge?
1) Cu – 65 2) Zn – 64 3) Ga – 69 4) Ge - 72
13. Which nucleus contains the greatest number of neutrons? 4) P – 33
2) S – 33
1) S – 32
3) P – 31
14. Which of the following nuclei has a nucleus with the fewest number of neutrons?
58 60 58 60
1) Co 2) Co 3) Ni 4) Ni
27 27 28 28
15. In which isotope does the nucleus contains the greatest number of nucleons?
1) 226 Ra 2) 224 Fr 3) 223 Rn 4) 210 At
85
88 87 86
16. Which symbol shows a proton to neutron ratio of 1 : 1 ?
1) H 2) F 3) S 4) K
32
39
1
19
1 9 16 19
17. In which nucleus is the ratio of protons to neutrons 1 : 1?
1) N - 14 2) N - 16 3) O – 15 4) O – 17
18. For most atoms with an atomic number of less than 20, nuclear stability occurs when the ratio of
neutrons to protons is 1 : 1 . Which of the following atoms is likely to have a stable nucleus?
24
13
16
3
1) He 2) C 3) N 4) Mg
Copyright©2010 E3 Scholastic Publishing. All Rights Reserved. SurvivingChem.com 171
Topic 3 - The Atomic Structure
10. Continues
14
14
5. The nuclides C and N are similar in that they both have the same
1) Mass number 2) Atomic Number 3) Number of neutrons 4)Nuclear charge
6. Which pair of atoms do the nuclei contain the same number of neutrons?
1) 7 Li and Be 2) K and K 3) Ca and Ar 4) N and O
40
42
41
40
14
16
9
3 4 19 19 20 18 7 8
7. In which pair do the atoms have the same number of neutrons?
1) 24 Mg and Na 2) N and O 3) Si and P 4) S and S
16
15
24
33
32
31
32
8. Which two isotopes contain the same number of neutrons? 4) H-3 and He-4
Teacher Preview Copy
Teacher Preview Copy
1) H-1 and He-3
3) H-3 and He-3
2) H-2 and He-4
9. In which pair of atoms do the nuclei contain the same number of neutrons?
1) Calcium-40 and Calcium-42
3) Bromine – 83 and Krypton - 83
2) Chlorine-35 and Sulfur- 34 4) Iodine – 127 and Bromine – 80
10. Which pair of atom does the nuclide contains the same number of nucleons?
1) 121 Sn and 119 Sn 2) O and F 3) 222 Ra and 222 Rn 4) 226 Ra and 228 Ra
1 9
20
50 50 8 9 88 86 88
88
11. Which isotope contains the greatest nuclear charge? 40 40
42
37
1) Cl 2) K 3) Ar 4) Ca
12. Which symbol has the smallest nuclear charge?
1) Cu – 65 2) Zn – 64 3) Ga – 69 4) Ge - 72
13. Which nucleus contains the greatest number of neutrons? 4) P – 33
2) S – 33
1) S – 32
3) P – 31
14. Which of the following nuclei has a nucleus with the fewest number of neutrons?
58 60 58 60
1) Co 2) Co 3) Ni 4) Ni
27 27 28 28
15. In which isotope does the nucleus contains the greatest number of nucleons?
1) 226 Ra 2) 224 Fr 3) 223 Rn 4) 210 At
85
88 87 86
16. Which symbol shows a proton to neutron ratio of 1 : 1 ?
1) H 2) F 3) S 4) K
32
39
1
19
1 9 16 19
17. In which nucleus is the ratio of protons to neutrons 1 : 1?
1) N - 14 2) N - 16 3) O – 15 4) O – 17
18. For most atoms with an atomic number of less than 20, nuclear stability occurs when the ratio of
neutrons to protons is 1 : 1 . Which of the following atoms is likely to have a stable nucleus?
24
13
16
3
1) He 2) C 3) N 4) Mg
Copyright©2010 E3 Scholastic Publishing. All Rights Reserved. SurvivingChem.com 171
