Write the noble gas electron configuration of a Tc⁴⁺ ion (assume that it is in the ground state) and give the number of electrons that are not paired.

A +3 cation has a ground-state electron configuration of [Ar]. Identify the cation symbol.

The ground-state electron configuration for a cation with a 3+ charge is: [Xe] 4f¹⁴ 5d¹⁰ 6s². What is this cation?

Nitrogen gains three electrons to form the nitride anion. Illustrate the process using an electron orbital diagram.

Determine if the V³⁺ ion has a noble-gas configuration.