Question

Choose the elements whose atom you expect to have smaller atomic radius and give reason.

a) S or O

b) O or F​

Answer 1

atomic radius increases down the group(as number of shells in each element increases with increase in no. of electrons) and decreases across the period(due to inc in nuclear charge)

in group 16

O lies above S so has less atomic radius than S

in period 2

O lies before F so has higher atomic radius