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  4. How many electrons are present in the M shell of the atom of an element with atomic number 24?

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Q. How many electrons are present in the M shell of the atom of an element with atomic number 24?

EAMCETEAMCET 1999

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.