What is the electron configuration of the As3− ion?

1 Answer
Meave60
Nov 6, 2015

The electron configuration for the As3− ion is [Ar]3d104s24p6.

Explanation:

Arsenic, As, has atomic number 33, which is the number of protons in the nuclei of its atoms. A neutral As atom would also have 33 electrons. The electron configuration of a neutral arsenic atom is [Ar]3d104s24p3.

An arsenic 3- ion (As3−), has gained three electrons, and its electron configuration is [Ar]3d104s24p6, which is isoelectronic with the noble gas krypton, Kr.

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