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1)how many electrons in an atom may have the following quantum numbers?n=4,m=-1/2

2)name the element having highest -ve electron gain enthalpy


1) zero..bcuz m cant be -1/2..as if n=4 then l=0,1,2,3 and then m=-3,-2,-1,0,1,2,3..
2)element having highest electron gain enthaply is chlorine
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