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Identify the atomic number of an element that contains number of electrons in the M shell is equal to the number of electrons in the K and L shell



It is not possible because maximum no. of electrons in k shell is 2 ans then l shell can hold 8 electrons . therefore they cannot be equal
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There is no possibility to have equal no of electrons in every shell..
but it is possible to have equal electrons in K=L or K=M or L=M.
K=L it can be 2=2 which is Beryllium 
K=M it can be 2=2 which is Magnessium
L=M it can be 8=8 which is Argon.
please conform your question then ask....  :)
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