Consider the ground state of chromium atom $(Z=24)$. How many electrons are with Azimuthal quantum number $l=1$ and $l=2$ respectively?

The electronic configuration of three elements $A$,$B$,and $C$ are given below. Stable form of $A$ may be represented by the formula:
$A : 1s^2, 2s^2, 2p^6$
$B : 1s^2, 2s^2, 2p^6, 3s^2, 3p^3$
$C : 1s^2, 2s^2, 2p^6, 3s^2, 3p^5$

Which of the following atoms,in its ground state,has the highest number of unpaired electrons?

Consider the following schematic plots of radial orbital wavefunction $(\psi)$ against distance $(r)$ from the nucleus. The figure representing an orbital with two radial nodes is

The number of radial nodes of $3s$ and $2p$ orbitals are respectively.

Under normal conditions,which of the following electronic configurations is able to form a dipositive ion?