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Bohr's Model of an Atom

Identify the ...

Question

Identify the principal quantum number for the last electron that is added to sodium?

A

1

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B

2

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C

3

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D

5

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E

4

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Solution

The correct option is D 3
Electronic configuration of sodium (Z = 11) : $1 s^{2}$ $2 s^{2}$ $2 p^{6}$ $3 s^{1}$
Thus last electron is added to principle quantum number equal to $3$ .

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