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Multi-Electron Configurations and Orbital Diagrams

with atomic n...

Question

____________ with atomic number $9$ has electronic configuration is $2, 7$ .

A

Fluorine

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B

Chlorine

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C

Bromine

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D

None of the above

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Solution

The correct option is D Fluorine
$_{9} F = 1 s^{2} 2 s^{2} 2 p^{5}$

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