1.

Be's 4th electron will have four quantum numbers [MNR 1985]

A.                 \[n\]- 1       \[l\]- 0         \[m\]- 0        \[s\]- +1/2
B.                  \[n\]- 1       \[l\]- 1        \[m\]- +1      \[s\]- +1/2
C.                  \[n\]- 2       \[l\]- 0         \[m\]- 0         \[s\]- -1/2
D.                  \[n\]- 2       \[l\]- 1         \[m\]- 0         \[s\]- +1/2
Answer» D.                  \[n\]- 2       \[l\]- 1         \[m\]- 0         \[s\]- +1/2


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