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# Which of the following ions would be unlikely to exist, based on the octet rule? A) S2-B) Mg+C) N3-D) K+ E) F-

Which of the following ions would be unlikely to exist, based on the octet rule?

A) S^2-

B) Mg+

C) N^3-

D) K+

E) F-

Solution: An octet rule states that atoms of most elements would like to have eight valence electrons. Atoms of different elements tend to gain or lose electrons to achieve an octet.

Group 1 elements have one valence electrons and need to lose one electron to gain an octet, gaining a +1 charge.

Elements in Group 2 (2 valence electrons) lose 2 electrons, gaining a +2 charge.

Elements in Group 16 (6 valence electrons), gain 2 electrons, and have a -2 charge.

Elements in Group 17 (7 valence electrons), gain 1 electron and have a -1 charge.

Elements in Group 15 (5 valence electrons), tend to gain 3 electrons, and have a -3 charge.

S = Group 16, should have a -2 charge

Mg = Group 2, should have a +2 charge

N = Group 15, should have a -3 charge

K= Group 1, should have a +1 charge

F = Group 17, should have a -1 charge

Choice B is correct