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What is the significance of principal quantum number

Answer» PRINCIPAL quantum number(n) can have values 1,2,3,4 etc.It can give an IDEA about the size and energy of an orbital. It identifies the energy levels or the shell.n=1,2,3,4 etc
n=1 1st energy level K shell AND SO ON
The number of orbitals allowed in each shell is given by n2. All orbitals of a given value of n constitute a SINGLE shell. THUS IT DETERMINES SIZE. !!!

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