Problem: What element has a +2 cation with the electron configuration [Ar]3d9?A) ZincB) CopperC) GalliumD) CadmiumE) Silver

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We’re being asked to determine the element of a +2 cation with an electron configuration of [Ar]3d9


Let’s determine the chemical symbol this cation is isoelectronic with.

Isoelectronic means that two species have the same number of electrons.


The cation has an electronic configuration of [Ar]3d9:


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Problem Details

What element has a +2 cation with the electron configuration [Ar]3d9?

A) Zinc

B) Copper

C) Gallium

D) Cadmium

E) Silver