1.

Identify the atomic numbers of the pair of elements whichpossessessame number of electrons in L and M shells.

Answer»

12 , 18
19 , 20
18 , 16
17 , 18

Solution :`{:("ATOMIC NUMBER (Z)","Electronic configuration"),(""19,""2_(,)8_(,)8_(,)1),(""20,""2_(,)8_(,)8_(,)2):}`


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