General Science Chemistry Classification of Elements and Periodicity in Properties

નીચેનામાંથી કઈ ઉમદા વાયુની ઇલેક્ટ્રોનિક ગોઠવણી નથી?

1
2, 8, 18, 8
2
2, 8, 18, 2
3
2, 8
4
2, 8, 18, 18, 8

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