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if there were three possible values ( -1/2,0,+1/2) and for spin quantum numbers then total number of elements in second period of mordern periodic table is :- (a) 8 (b) 12 (c)18 (d) 32. HOW!!!? ANSWER IN BOOK IS (B) 12
if there are 3 possible values for spin quantum numbers each orbital would occupy 3 electrons each. since there are 4 orbitals [1s and 3p] the total number elements will be 12
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