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4. State the expected numeric value of the charge (+1,-1, etc.) for each of the follow a. a cation in group 1A b. a cation in group 2A c. a main-group cation in group 3A d. a main-group anion in group 5A e. a main-group anion in group 6A f. a main-group anion in group 7A

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Answer #1

a) +1

A cation in group 1 has one valence electron to lose and the charge becomes +1.

b) +2

A cation in group 2 has 2 valence electrons to lose and the charge becomes +2.

c) +3

Group 3A contains aluminum group elements who need to lose 3 electrons to achieve Noble gas configuration.

d) -3

Group 5A contains nitrogen group elements who need to take in 3 electrons.

e) -2

Group 6A contains oxygen group elements.

f) -1

Group 7A contains fluorine group elements.

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