The presence of three unpaired electrons in a nitrogen atom is explained by .......

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 $3f$

Explain $2p$ orbitals.

Which pair of atoms or ions will have the same electronic configuration?

How many orbitals is/are possible with $n=3$,$l=1$ and $m_l=-1$ values?

Which of the following represents the electronic configuration of an element with atomic number $17$?