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  • Which of the following elements has the outermost 2s1  configuration? Option: 1 Na <s

Which of the following elements has the outermost 2s1  configuration? 

Option: 1

Na 


Option: 2

He 


Option: 3

Li 


Option: 4

K 


Answers (1)

best_answer

The electronic configuration of the elements are - 

Li\rightarrow 1s^{^{2}}2s^{1}or\ [He]2s^1

Ne\rightarrow 1s^{^{2}}2s^{2}2p^{6}

Na\rightarrow 1s^{^{2}}2s^{2}2p^{6}3s^{1} or [Ne]3s^{1}

K\rightarrow 1s^{^{2}}2s^{2}2p^{6}3s^23p^64s^1\ or \ [Ar]4s^1
The correct answer is option 3. 

 

 

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Rishi

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