Which one the following configuration represents noble gas, Chemistry

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Which one of the following configuration represents a noble gas:

(1) 1s2, 2s2, 2p6, 3s2,      

(2)1s2, 2s2, 2p6, 3s1       

(3) 1s2, 2s2, 2p6,              

(4)1s2, 2s2, sp6, 3s2, 3p6, 4s2

Ans: 1s2, 2s2, 2p6,

 


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