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The problem

How many electrons does the netural atom gain or lose to form each of the following ions?

The answer is contained in the question. If there is a "+", elecrons are lost. If there is a "-", electrons are gained. The number gained or lost equals the ion charge. The charge of I- is minus 1.

okay thanks.. one more question

the problem
Write the name of the following polyatomic ions.

Memorize these quickly.

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