Question

The singly-bonded metallic radius of $Na$ is $154$ pm. Assume that the increment between radii of different magnitudes is $60$ pm, then the covalent radius of $Na$ is:

• A. $154$ pm
• B. $97$ pm
• C. $217$ pm
• D. $267$ pm

Answer 1

The correct option is A $154$ pm

Since, $Na$ forms only ionic bonds with negatively charged species, the covalent radius of $Na$ is nothing but singly ionic bonded metallic radius of $Na$ i.e. 154 pm.

Hence, the correct answer is $\left(A\right)$.