Question

plz answe immediately. iam very tension about this any one help☹​

Answer 1

$\tt{\underline {Quantum\: numbers}}$ :

To describe each electron in an atom in different orbitals, we need a set of four numbers known as Quantum Numbers.

There are 4 types of Quantum numbers :

1 ). Principal Quantum Number ( n )

2 ). Azimuthal Quantum Number ( l )

3 ). Magnetic Quantum Number ( ml )

4 ). Spin Quantum Number ( ms )

$\tt {\underline {Pauli \:Exclusion \:Principle}}$ :

No two electrons in an atom can have same value for all the four quantum numbers.

Also, it states that an orbital can have maximum of two electrons.