The electron configuration of $Fe^{3+}$ is (atomic number of $Fe = 26$)

Arrange the following orbitals in decreasing order of energy:
$A$. $n = 3, l = 0, m = 0$
$B$. $n = 4, l = 0, m = 0$
$C$. $n = 3, l = 1, m = 0$
$D$. $n = 3, l = 2, m = 1$
The correct option for the order is:

An element has the electronic configuration $1s^2, 2s^2 2p^6, 3s^2 3p^6 3d^5, 4s^1$. It is a

What are the electronic configurations of elements with atomic numbers $Z = 117$ and $Z = 120$?

Which of the following represents the ground state electronic configuration of an atom?

The state of an electron in a $3d_{z^2}$ orbital is described by which quantum numbers?