Which of the following atoms will have the same electron configuration? I. N−3
II. O+2
III. F−1
IV. Li−1
V. Be+2

I. N−3

III. F−1

Explanation:

A positive charge indicates a loss of electrons whereas a negative charge denotes electron gain.

For two species to have the same electron configuration, they must have the same number of electrons within their atomic space.

So, the solution to this problem will be two species with the same number of electrons:

    Nitrogen in neutral state has 7 electrons, on gaining 3 the electrons becomes 10

   Fluorine in neutral state has 9 electrons, on gaining 1 more, it will have 10 electrons.

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