A) 5
B) 6
C) 12
D) 13
Correct Answer: D
Solution :
The electronic configuration of element having atomic number 24 is: \[\underset{K}{\mathop{1{{s}^{2}},}}\,\underset{L}{\mathop{2{{s}^{2}}2{{p}^{6}},}}\,3{{s}^{2}}\underset{M}{\mathop{3{{p}^{6}}}}\,3{{d}^{5}},\underset{N}{\mathop{4{{s}^{1}}}}\,\] Third shell is the M shell. So, M shell contains 13 electrons.
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