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Multi-Electron Configurations and Orbital Diagrams

Which of the ...

Question

Which of the following has a noble gas electron configuration?

A

{F e}^{2 +}

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B

C l

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C

K^{+}

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D

C s

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E

A u

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Solution

The correct option is D $K^{+}$
$K^{+} = [A r]$

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