2^nd Postulate

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In the first postulate we refer to orbit to be in circular for, and they harbor electron. But it should interest you to know that not all circular orbit allowed electron. The orbit that allowed electron, are orbit with angular momentum of electron, mvr, and are the same with multiple integral of h/2π are permitted.

Value n = 1 is the first orbit, and is the smallest among all the orbit, larger orbit has higher n value, like n = 5, n =6 an so on.