Question

The correct sequence which shows decreasing order of the ionic radii of the elements is (a) Al³⁺ > Mg²⁺ > Na⁺ > F⁻ > O²⁻(b) Na⁺ > Mg²⁺ > Al³⁺ > O²⁻ > F⁻(c) Na⁺ > F⁻ > Mg²⁺ > O²⁻ > Al³⁺(d) O²⁻ > F⁻ > Na⁺ > Mg²⁺ > Al³⁺

Answer 1

It's the B option as moving down the group radius increases while moving across the period radius decreases