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Questions for Thought
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1

Describe how the following are alike and how they are different: (a) a sodium atom and a sodium ion, and (b) a sodium ion and a neon atom.
2

What is the difference between a polar covalent bond and a nonpolar covalent bond?
3

What is the difference between an ionic and covalent bond? What do atoms forming the two bond types have in common?
4

What is the octet rule?
5

Is there a relationship between the number of valence electrons and how many covalent bonds an atom can form? Explain.
6

Write electron dot formulas for molecules formed when hydrogen combines with (a) chlorine, (b) oxygen, and (c) carbon.
7

Sodium fluoride is often added to water supplies to strengthen teeth. Is sodium fluoride ionic, covalent, or polar covalent? Explain the basis of your answer.
8

What is the modern systematic name of a compound with the formula (a) SnF2? (b) PbS?
9

What kinds of elements are found in (a) ionic compounds with a name ending with an "-ide" suffix? (b) covalent compounds with a name ending with an "-ide" suffix?
10

Why is it necessary to use a system of Greek prefixes to name binary covalent compounds?
11

What are variable-charge ions? Explain how variable-charge ions are identified in the modern systematic system of naming compounds.
12

What is a polyatomic ion? Give the names and formulas for several common polyatomic ions.
13

Write the formula for magnesium hydroxide. Explain what the parentheses mean.
14

What is a double bond? A triple bond?





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