# Summarise the rul

(1) The maximum possible number of electrons which can be found in any level of the atom of an element is given by 2n2 (where n is the number of that energy level). By using this relation, we will find that :

(a) the maximum possible  number of electrons which can be accommodated in 1st energy level K shell, where n= 1,

2n2 = 2 X (1)2 = 2 X 1 = 2. Hence, K shell can have a maximum of 2 electrons.

(b) the maximum possible  number of electrons which can be found  in 2nd energy level, L shell, where n = 2 , 2n2 =2 X (2)2 = 2 X 4 = 8. L shell can have a max 8 electrons.

(c) the maximum possible  number of electrons which can be found  in 3rd energy level M shell, where n = 3, 2n2 = 2 X (3)2 = 2 X 9 = 18. M shell can have a max 18 electrons.

(d) the maximum possible  number of electrons which can be found in 4th energy level N shell, where n = 4. 2n2 = 2 X (4)2 = 2 X 16 = 32. N shell can have a max 32 electrons.

(2)The electrons in an atom can not occupy a newer shell unless all the inner shells filled with electrons. This means that first, all the electrons fill K shell, then L shell, then M shell, then N shell, and so on.

(3) The electron in the outer shell of the first 18 elements cannot be more than 8 electron in the outermost shell

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