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

Which of the following statements are true?
$(A)$ The subsidiary quantum number $\ell$ describes the shape of the orbital occupied by the electron.
$(B)$ The image shows the boundary surface diagram of the $2p_x$ orbital.
$(C)$ The $+$ and $-$ signs in the wave function of the $2p_x$ orbital refer to charge.
$(D)$ The wave function of the $2p_x$ orbital is zero everywhere in the $yz$ plane.

Following Hund's rule,which element contains six unpaired electrons?

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

An atom has $35$ nucleons and an atomic number equal to $17$. The number of electrons with $n = 2$ and $m = 0$ in it is:

The configuration $1s^2 2s^2 2p^5 3s^1$ shows: