For singly ionized helium (He , )

CHEMISTRY · Single correct · CBSE · Chemistry · Structure of Atom · Structure of Atom

Problem

For singly ionized helium (He

^{+}

Z=2

), the electron in the

n=2

orbit has radius

r_{2,\mathrm{He}^{+}}

. Hydrogen’s ground-state orbital radius is

r_{1,\mathrm{H}}

. What is the value of the ratio

\dfrac{r_{2,\mathrm{He}^{+}}}{r_{1,\mathrm{H}}}

? (a)

4.0

(b)

0.50

(c)

2.0

(d)

1.0