Question

what is principal quantum no.​

Answer 1

Answer:

Principal Quantum Number is one of the Quantum Number in chemistry which are assigned to electrons to know about their characteristics and properties.

It is denoted by the symbol 'n'.

It describes the periods or size of orbitals.

For example, n = 1 denotes the period 1 or shell 1.

Similarly, n = 2,3,4,..... denotes the respective shell number and period numbers.

It can never be zero, i.e., n ≠ 0.

It describes the size of electron orbital.