1.

Which of the following sequence is correct as per Aufbau principle                                          [DPMT 2005]

A.                 \[3s<3d<4s<4p\]             
B.                 \[1s<2p<4s<3d\]
C.                 \[2s<5s<4p<5d\]             
D.                 \[2s<2p<3d<3p\]
Answer» C.                 \[2s<5s<4p<5d\]             


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