Question

The order in which the atomic radius increases is as follows

• A. $Li>Be>B$
• B. $Li<Be<B$
• C. $Li>B<Be$
• D. $Li<B>Be$

Answer 1

The correct option is A $Li>Be>B$

The atomic $\&$ ionic radii of group 13 elements are smaller than the corresponding elements of group 1 and 2 in the same period. This is due to increase in effective nuclear charge $\&$ electrons are pulled inwards resulting in a decrease in atomic size.