Question

The radius of hydrogen atom in ground state is $0.53\overset{o}{A}$ . What will be the radius of $3Li^{2 +}$in the ground state?

• A. $1.06\overset{o}{A}$
• B. $0.265\overset{o}{A}$
• C. $0.17\overset{o}{A}$
• D. $0.53\overset{o}{A}$

Answer 1

Answer: (C)

$0.17\overset{o}{A}$

Answer 2

: Radius of n^th orbit is given by $r_{n} = \frac{r_{0} \times n^{2}}{Z}$

Fro $3Li^{2 +},r = \frac{r_{0}}{3} = \frac{0.53}{3} = 0.176\overset{o}{A}$