The number of $2p$ electrons having spin quantum number $s = - 1/2$ is

In the following pairs,which orbital experiences greater nuclear attraction?
$(i)$ $4f$ and $5d$ $(ii)$ $4d$ and $5s$ $(iii)$ $7s$ and $5f$ $(iv)$ $7p$ and $5p$
$(v)$ $3d$ and $3f$

What is the electronic configuration of an atom? Explain its method with examples.

The maximum number of electrons that can have principal quantum number,$n=3$,and spin quantum number,$m_s=-1/2$,is

${}_{24}Cr$ has configuration $3d^5\,4s^1$ instead of $3d^4\,4s^2$ because of

The atomic orbital is: