Question

Calculate the ration of the radius of Li2+ ion in third energy level to that of He+ ion in second energy level.

Answer 1

Explanation:

Correct option is

A

2

Radius of hydrogen like species (one electron atoms) is given by:

r=0.529×

Z

n

2

for H, r=0.529

for He

+

n=2 and Z=2

r=0.529×

2

2

2

r=0.529×2

Therefore answer is 2.