Which of the following is the lowest principal quantum number, an electron can have?

1

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2

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5

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3

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Solution

The correct option is A $1$
The lowest principal quantum number an electron can has is 1. The principal quantum numbers start from 1 and are $1, 2, 3$ ... Thus the lowest principal quantum number is 1.

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n = 3

m_{s} = - \frac{1}{2}

s = 1 / 2

m_{s} = - \frac{1}{2}

m_{s} = - \frac{1}{2}

m_{s} = + \frac{1}{2}

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