Which is not a correct ion?
li2+
cl-
Al3
O2-

The answer is option 1.

Explanation:

Lithium is a Group 1 element. So the correct charge for lithium should be Li+.

(a)

Explanation:

Answer is (a)

As lithium has only one valence electron, it will lose one electron to form a cation with charge 1+ . Thus the correct Li ion is

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