Question

The ratio between radii of $He^{+}$ ion and H atom is

• A. $\frac{1}{2}$
• B. 1
• C. $\frac{3}{2}$
• D. 2

Answer 1

Answer: (B)

1

Answer 2

Value of Z for hydrogen =1

Value of Z for helium = 2

Value of n for both is = 1

$r_{H} = \frac{0.52 \times 1^{2}}{1}$ $r_{He^{+}} = \frac{0.52 \times 1^{2}}{1}$

$\frac{r_{H}}{r_{He^{+}}} = 1:1$ or $r_{He^{+}}:r_{H} = 1:1$