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An ion has the following Lewis structure where xis an unknown element Which of the following elements could be X? N As F IP Cl Br (There may be more than one possible answer.) Enter your answer by typing the symbol of the element(s) in the box below. If more than one element is possible, separate the symbols of the elements with a comma

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Answer #1

Formal charge on F = 0

Formal charge on O = -1

But charge on molecule is -2

So,

formal charge on X = -1

In structure X is contributing 8 electrons [4 electrons in lone pair and 4 electrons in bond]

Out of this 8 electrons, 1 is coming because of formal charge.

So, number of valence electron in X is 7

It can be halogens except Fluorine.

Fluorine do not expand its octet and can form maximum 1 bond

So, answers are Cl and Br

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