# What is the oxidation number of a zinc atom with an electron conﬁguration of [Ar]3d^10?

Nov 5, 2015

A zinc ion with the electron configuration $\text{[Ar]3d"^10}$ has an oxidation number of +2.

#### Explanation:

The electron configuration for a neutral zinc atom is $\text{[Ar]3d"^10"4s"^2}$.

A zinc 2+ ion has the electron configuration of $\text{[Ar]3d"^10}$, as it has lost its two valence electrons $\text{4s"^2}$. The oxidation number of an ion is the same as its charge.

Nov 5, 2015