Question

Energy of an electron in an orbit of $H$-atom is $-\frac{R_H}{4}$. The no. of degenerate orbitals in this orbit are :

• A. $4$
• B. $3$
• C. $5$
• D. $2$

Answer 1

The correct option is A $4$

Energy of an electron in an orbit of $H$-atom is $-\frac{R_H}{4}$. The no. of degenerate orbitals in this orbit are 4.
$-\frac{R_H}{4}=\frac{R_H}{n^2}$.
Hence, $n^2=4$ or $n=2$.
Hence, the electron benlongs to second orbit with one 2s and three 2p orbitals all of which are degenerate.