Question

1. What is principal quantum number and explain its significance? ​

Answer 1

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$\textsf\purple{ANSWER :-}$

✒️The principal quantum number specifies the energy of the electron in the orbital, and, as n increases from its lowest value 1 through its allowed values 2, 3 the energies of the corresponding orbitals.

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Answer 2

The numerals, called principal quantum numbers, indicate energy levels as well as relative distance from the nucleus. A 1s electron occupies the energy level nearest the nucleus. A 2s electron, less strongly bound, spends most of its time farther away from the nucleus.

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