If K and L shells of an atom are filled and there are 4 electrons in the M shell, then what is the atomic number and valency of this atom?

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Solution

Dear Student,
The K shell can accomodate 2 electrons and the L shell can accomodate a total of 8 electrons, and if the M-shell contains 4 electrons, then the electronic configuration of the atom will be 2, 8, 4, thus the atomic number of the element would be 14. The element is silicon and it has a valency of 4.
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