Question

The ionic radii of A⁺ and B⁻ are 0.98 × 10⁻¹⁰ m and 1.81 × 10⁻¹⁰ m. The coordination number of each ion in AB is ______.

Options

• 8

• 2

• 6

• 4

Answer 1

The ionic radii of A⁺ and B⁻ are 0.98 × 10⁻¹⁰ m and 1.81 × 10⁻¹⁰ m. The coordination number of each ion in AB is 6.

Explanation:

Given: Ionic radius of A⁺ = 0.98 × 10⁻¹⁰ m

Ionic radius of B⁻ = 1.81 × 10⁻¹⁰ m

Formula: Radius ratio = `(rA^+)/(rB^-)`

= `(0.98 xx 10^(−10))/(1.81 xx 10^(−10))`

= 0.54 ≈ 6

∴ The coordination number of each ion in AB is 6.