Question

The set of principal $\left(n\right)$, azimuthal $\left(l\right)$ and magnetic $\left(m_l\right)$ quantum numbers that is not allowed for the electron in $H$-atom is:

• A. $n=3,l=1,m_1=-1$
• B. $n=3,l=0,m_1=0$
• C. $n=2,l=1,m_1=0$
• D. $n=2,l=2,m_1=-1$

Answer 1

The correct option is D $n=2,l=2,m_1=-1$

The set of principal (n), azimuthal (l) and magnetic (ml) quantum numbers that are not allowed for the electron in H-atom is:

$n=2,l=2,m_1=-1$

For a given value of $n$, the acceptable values of $l$ are $0,1,2,\mathrm{3.....}(n-1)$.

Hence, option D is correct.