The atomic orbital is:

An orbital is defined as:

Given,
$(A)$ $n=5, m_l=-1$
$(B)$ $n=3, l=2, m_l=-1, m_s=+\frac{1}{2}$
The maximum number of electron$(s)$ in an atom that can have the quantum numbers as given in $(A)$ and $(B)$ respectively are:

Which of the following sets of quantum numbers is not possible?

In which of the following cases are both the Pauli exclusion principle and Hund's rule violated?

In Niobium $(Z = 41)$,the number of electrons with $m = -1$ will be: