For electrons having principal quantum number $n = 3$,the number of $(i)$ subshells and $(ii)$ orbitals would be respectively:

Which of the following sets of quantum numbers is correct for an electron in a $3d$-orbital?

Which electronic configuration must represent an atom in an excited state?

Which of the following orbitals represents $3d_{z^2}$ orbitals?

Identify the orbital having the lowest energy from the following.

The general configuration of the outermost and penultimate shell is $(n - 1)s^2 (n - 1)p^6 (n - 1)d^x ns^2$. If $n = 4$ and $x = 5$,then the number of protons in the nucleus will be: