Question

How many unpaired electrons are in a $\text{N}$ atom?

Answer 1

The nucleus of the atom contains the protons and the neutrons. The outermost regions of the atom are called electron shells and contain the electrons (negatively charged). Electrons revolve in different orbits having different energy levels.
For arrangement of electrons in each shell, bohr bury rule is applied.

Complete step by step answer:
Nitrogen is the chemical element with the symbol N and atomic number 7.
The electronic configuration of $\text{N}$ is $1{{s}^{2}}2{{s}^{2}}2{{p}^{3}}$
According to Hund's rule, all orbitals will be singly occupied before any is doubly occupied. Therefore, two p orbital get one electron and one will have two electrons. Hund's rule also stipulates that all of the unpaired electrons must have the same spin.
The p orbital is not completely filled it has only $3$ electrons when it should have 6 electrons
So Using Hund's rule, $\text{N}$ has $3$ electrons unpaired

Note:
Whenever two electrons are paired together in an orbital, or their total spin is $0$, they are diamagnetic electrons. Atoms with all diamagnetic electrons are called diamagnetic atoms. A paramagnetic electron is an unpaired electron. An atom is considered paramagnetic if even one orbital has a net spin.
Make sure you are well aware about hund's rule and give and fill electrons according to learn and understand these concepts as they will be used further.
Make sure you are well about the concepts of pairing and that is going to help you in understanding the concept of diamagnetic and paramagnetic nature of a substance that will be further useful.
You fill up the corresponding orbitals with electrons until you find out the electron arrangement, any left with one is called unpaired.