The atomic radius of lithium is larger than the atomic radius of nitrogen.

a. True

b. False

a. True

Explanation:

In the periodic table, all the elements are placed in a certain fashion, i. e., with increasing atomic number.

Since,

The element lithium and nitrogen are placed, in group 1 and 15 respectively.

as we go from left to right, across the group, the atomic radius decreases,

Because,

As, we go left to right, the number of electrons increases in the same shell, and proton too increases, which in turn increases the nuclear attraction, and the nucleus holds on to the electrons more firmly, and hence, the size reduces, as the electrons increases, in the same shell.

Hence, the given statement is true.