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Group A—Continued Group B—Continued
14. How many outer orbital electrons are found in an atom of 14. How many outer-orbital electrons are found in an atom of
(a) Li? (a) Na?
(b) N? (b) P?
(c) F? (c) Br?
(d) Cl? (d) I?
(e) Ra? (e) Te?
(f) Be? (f) Sr?
15. Write electron dot notations for the following elements: 15. Write electron dot notations for the following elements:
(a) Boron (a) Aluminum
(b) Bromine (b) Fluorine
(c) Calcium (c) Magnesium
(d) Potassium (d) Sodium
(e) Oxygen (e) Carbon
(f) Sulfur (f) Chlorine
16. Identify the charge on the following ions: 16. Identify the charge on the following ions:
(a) Boron (a) Aluminum
(b) Bromine (b) Chlorine
(c) Calcium (c) Magnesium
(d) Potassium (d) Sodium
(e) Oxygen (e) Sulfur
(f) Nitrogen (f) Hydrogen
17. Use the periodic table to identify if the following are metals, 17. Use the periodic table to identify if the following are metals,
nonmetals, or semiconductors: nonmetals, or semiconductors:
(a) Krypton (a) Radon
(b) Cesium (b) Francium
(c) Silicon (c) Arsenic
(d) Sulfur (d) Phosphorus
(e) Molybdenum (e) Hafnium
(f) Plutonium (f) Uranium
18. From their charges, predict the periodic table family number for 18. From their charges, predict the periodic table family number for
the following ions: the following ions:
(a) Br 1– (a) F 1–
(b) K 1+ (b) Li 1+
(c) Al 3+ (c) B 3+
(d) S 2– (d) O 2–
(e) Ba 2+ (e) Be 2+
(f) O 2– (f) Si 4+
19. Use chemical symbols and numbers to identify the following 19. Use chemical symbols and numbers to identify the following
isotopes: isotopes:
(a) Oxygen-16 (a) Potassium-39
(b) Sodium-23 (b) Neon-22
(c) Hydrogen-3 (c) Tungsten-184
(d) Chlorine-35 (d) Iodine-127

8-25 CHAPTER 8 Atoms and Periodic Properties 227