What are the total number of electrons present in $s$ and $p$ orbitals respectively in the ground state of an argon atom $(Z = 18)$?

In the ground state, an element has $13$ electrons in the $M$ shell. The element is

Two statements are given below:
Statement $I$: In $H$ atom, the energy of $2s$ and $2p$ orbitals is same.
Statement $II$: In $He$ atom, the energy of $2s$ and $2p$ orbitals is same.
The correct answer is:

The electronic configuration $1s^2, 2s^2 2p^5, 3s^1$ represents:

After the $np$ orbital is completely filled,in which orbital does the next electron enter?

What is the electronic configuration of $Cu^{2+} (Z = 29)$ in its ground state?