CHAPTER 2 ANSWERS
1. C
2. B
3. C
4. B
5. C
6. D
7. C
8. A
9. D
10. A
11. F
12. G
13. B
14. H
15. D
16. A
17. element symbol, atomic number, atomic mass, common ion charge
18. (a) Ca 20p 2, 8, 8, 2
(b) Ca2+ 20p 2, 8, 8
19. For example, soft, low melting point, highly reactive with air, highly reactive with water.
20. (a) A valence electron is an electron in the outermost occupied energy level of an atom.
(b) Elements in the same chemical family have the same number of valence electrons.
(c) Gain
1. C
2. B
3. C
4. B
5. C
6. D
7. C
8. A
9. D
10. A
11. F
12. G
13. B
14. H
15. D
16. A
17. element symbol, atomic number, atomic mass, common ion charge
18. (a) Ca 20p 2, 8, 8, 2
(b) Ca2+ 20p 2, 8, 8
19. For example, soft, low melting point, highly reactive with air, highly reactive with water.
20. (a) A valence electron is an electron in the outermost occupied energy level of an atom.
(b) Elements in the same chemical family have the same number of valence electrons.
(c) Gain