Be's 4th electron will have four quantum numbers:

          n       l         m          s

(1)     1       0         0        +1/2

(2)     1       1        +1      +1/2

(3)      2       0         0         - 1/2

(4)      2       1         0         +1/2

Ans:   2       0         0         - 1/2

 

Posted Date: 5/20/2013 1:22:57 AM | Location : United States

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