Question

For the elements, $\left[1-36\right]$There are two exceptions to the filling order as predicted from the periodic table. Draw the atomic orbital diagram for the two exceptions and indicate how many unpaired electrons are present.

Short answer

The knowledge about the distribution of electrons in various energy shells, subshells and orbitals in an atom in the ground state is known as electronic configuration.

Step-by-step solution

electronic configuration of Cr and Cu:

For Chromium the expected electronic configuration is $\left[\mathrm{Ar}\right]4s^{2}3d^4$. However, the observed or actual configuration of Cr is $\left[\mathrm{Ar}\right]4s^{2}3d^5$.

The configuration ofCopper is expected to be $\left[\mathrm{Ar}\right]4s^{2}3d^9$. However, the actual or observed configuration is

$\mathrm{Cu}=\left[\mathrm{Ar}\right]4{\mathrm{s}}^{1}3{\mathrm{d}}^{10}$

Atomic Orbital diagram:

The orbital diagram consists of a square box. For each orbital available in a given energy level grouped by sublevels with an arrow indicating the presence and its direction (usually upward is for the clockwise direction of spin and downward is for the anticlockwise direction of spin.

Orbital diagram for Cr and Cu: