Question

Correct order of radius of the $I$st orbit of H, He+, Li2+, Be3+ is :

• A. H > He+> Li2+ > Be3+
• B. Be3+> Li2+> He+ > H
• C. He+> Be3+ > Li2+ > H
• D. He+> H > Li2+ > Be3+

Answer 1

Answer: (A)

H > He+> Li2+ > Be3+

Answer 2

$r\alpha\left( \frac{n^{2}}{Z} \right)$ As Z increases, radius of I orbit decreases.