A) There are seven principal electron energy levels
B) The second principal energy level can have four sub-energy levels and contains a maximum of eight electrons
C) The \[M\]energy level can have maximum of 32 electrons
D) The \[4s\] sub-energy level is at a higher energy than the \[3d\] sub-energy level
Correct Answer: B
Solution :
The second principal shell contains four orbitals viz \[2s,\,2{{p}_{x}},\,\,2{{p}_{y}}\] and \[2{{p}_{z}}.\]
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