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HOW THE NO.OF ATOMS ARE GIVEN TO EACH SHELL?
An electron in an atom is characterized by a set of four quantum numbers, and the principal quantum number (n ) defines the main energy level known as shell. We have also studied about the filling of electrons into different sub shells, also referred to as orbitals (s, p, d, f ) in an atom. The distribution of electrons into orbitals of an atom is called its electronic configuration. An element’s location in the Periodic Table reflects the quantum numbers of the last orbital filled.The number of electrons in various shells can be calculated by the formula 2n2 where n have values from n=1,2,3...The electron shells are labeled K, L, M, N, O, P, and Q; or 1, 2, 3, 4, 5, 6, and 7; going from innermost shell outwards.For K shell n=1.therefore the number of electrons that can be accommodated in K shell is 2(1)2=2 electrons.For L shell n=2,2n2=2(2)2=8 electrons and so on..


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