Question

Given below are four ions:

Cl⁻, Li⁺, Al³⁺, K⁺

Identify the pair of ions which have the same electronic configuration.

[Atomic number: Cl = 17, Li = 3, Al = 13, K = 19]

Options

• Cl⁻ & Li⁺

• Al³⁺ & Ki⁺

• Cl⁻ & K⁺

• Li⁺ & K⁺

Answer 1

Cl⁻ & K⁺

Explanation:

Electronic configuration of Cl⁺ = 2, 8, 8; electronic configuration of Li⁺ = 2; electronic configuration of Al³⁺ = 2, 8; electronic configuration of K⁺ = 2, 8, 8. Therefore, Cl⁺ and K⁺ exhibit the same electronic configurations.