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General Chemistry Principles, Patterns, and Applications, 2011

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g. Pd<br />

h. Al<br />

6. Which has the higher ionization energy—H or H − ? Why?<br />

7. The electronegativities of hydrogen, fluorine, <strong>and</strong> iodine are 2.20, 3.98, <strong>and</strong> 2.66, respectively. Why, then, is<br />

HI a stronger acid than HF?<br />

8. If H 2 O were a linear molecule, would the density of ice be less than or greater than that of liquid water?<br />

Explain your answer.<br />

9. In addition to ion–dipole attractions, hydrogen bonding is important in solid crystalline hydrates, such as<br />

Na 4 XeO 6·8H 2 O. Based on this statement, explain why anhydrous Na 4 XeO 6 does not exist.<br />

A N S W E R S<br />

1. H has one electron in an s orbital, like the group 1 metals, but it is also one electron short of a filled principal<br />

shell, like the group 17 elements. Unlike the alkali metals, hydrogen is not a metal. Unlike the halogens,<br />

elemental hydrogen is not a potent oxidant.<br />

2.<br />

3.<br />

4.<br />

5.<br />

a. ionic; it is an alkaline earth metal.<br />

b. covalent; it is a semimetal.<br />

c. covalent; it is a nonmetal.<br />

d. ionic; it is an alkali metal.<br />

e. covalent; it is a semimetal.<br />

f. covalent; it is a period 2 alkaline earth metal.<br />

g. metallic; it is a transition metal.<br />

h. covalent; it is a group 13 metal.<br />

6.<br />

7.<br />

8.<br />

Saylor URL: http://www.saylor.org/books<br />

Saylor.org<br />

1932

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