

MCQOPTIONS
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1. |
According to Aufbau's principle, which of the three \[4d,\,5p\] and \[5s\]will be filled with electrons first [MADT Bihar 1984] |
A. | \[4d\] |
B. | \[5p\] |
C. | \[5s\] |
D. | \[4d\] and \[5s\] will be filled simultaneously |
Answer» D. \[4d\] and \[5s\] will be filled simultaneously | |