An electron has principal quantum number $n = 3$. The number of its $(i)$ sub-shells and $(ii)$ orbitals would be respectively:

The correct set of quantum numbers for the unpaired electron of $Cu$ atom is

The number of given orbitals which have electron density along the axis is $..........$. $p_{x}, p_{y}, p_{z}, d_{xy}, d_{yz}, d_{xz}, d_{z^2}, d_{x^2-y^2}$

Which of the following statements are correct?
$(A)$ The electronic configuration of $Cr$ is $[Ar] 3d^5 4s^1$.
$(B)$ The magnetic quantum number may have a negative value.
$(C)$ In the ground state of an atom, the orbitals are filled in order of their increasing energies.
$(D)$ The total number of nodes is given by $n-1$.
Choose the most appropriate answer from the options given below.

The atomic orbital is:

The two electrons $X$ and $Y$ have the following sets of quantum numbers:

$X: n=3, l=2, m=-2, s=+1/2$

$Y: n=3, l=0, m=0, s=+1/2$

Which of the following is the correct statement?