Options:
A.
B.
C.
D.
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Earlier discussion
1 older comment kept for context.
John Kenny Ade
We should be able to distinguish between an atom and an ion.
Firstly atom is the smallest indivisible particle of an element that can take part in a reaction.
While ion is a group of atoms or an atom that possesses either a positive or negative charge.
Therefore X2+ is an ion. It has lost two of its electrons to become a positive charge.
X2+ = 2,8,8 = 1S2, 2S2, 2P6, 3S2, 3P6.
Therefore the answer is C.