Problem: What is the electron configuration of Zn2+?A. [Ar] 4s2 3d10      B. [Ar] 3d10      C. [Ar] 4s2 3d8      D. [Ar] 4s2 3d10 4p1E. [Ar] 4s1 3d10

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We’re being asked to determine the total number of electrons in a Zn2+ ion

Before we can do that, let’s first determine the total number of electrons in a neutral gallium atom by writing its electron configuration.


You can determine the ground-state electron configuration of Zinc (Zn) by locating the position Zn in the periodic table.

Ground-state means that the element is in its lowest energy form (not in excited state). Neutral neon means it has no charge, meaning no electrons are removed or added in the atom.


You can see in the above illustration of the periodic table that Zn is in Period 4 and d-block.


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Problem Details

What is the electron configuration of Zn2+?

A. [Ar] 4s2 3d10      B. [Ar] 3d10      C. [Ar] 4s2 3d8      D. [Ar] 4s2 3d10 4p1
E. [Ar] 4s1 3d10