Find the number of unpaired electrons for copper in ground state configuration.

Given below are two statements :
Statement $I$ : $A$ spectral line will be observed for a $2p_x \rightarrow 2p_y$ transition.
Statement $II$ : $2p_x$ and $2p_y$ are degenerate orbitals.
In the light of the above statements,choose the correct answer from the options given below :

The maximum number of unpaired electrons that can be present in $d$-orbitals is

Show the distribution of electrons in an oxygen atom (atomic number $8$) using an orbital diagram.

The azimuthal quantum number for the valence electrons of $Ga^{+}$ ion is $.....$
(Atomic number of $Ga = 31$)

How many orbitals in a $Cr$ atom have $l = 0$?