summarise the rules for writing of distribution of electrons in various shells for the first 18th elements ?
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Summarise the rules for writing of distribution of electrons in various shells for the first eighteen elements. (ii) The maximum number of electrons that can be accommodated in the outermost orbit is 8. (iii) Electrons are not accommodated in a given shell unless the inner shells are filled.
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>> The various rules for writing of distribution of electrons in various shells of an atom are as follows:
(i) The maximum number of electrons which can be accommodated in any energy level of the atom of an element is given by 2 n² ( Where n is the number of that energy level ). By using this relation we will find that :
(a) the maximum number of electrons which can be accommodated in 1st energy level (n=1) or K shell is 2 × (1)² = 2 × 1 = 2
(b) the maximum number of electrons which can be accommodated in 2nd energy level (n=2) or L shell is 2× (2)² = 2 × 4 = 8.
(c) the maximum number of electrons which can be accommodated in 3rd energy level (n=3) or M shell is 2 × (3)² = 2 × 9 = 18
(d) the maximum number of electrons which can be accommodated in 4th energy level (n=4) or N shell is 2 × (4)² = 2 × 16 = 32.
(ii) The outermost shell of an atom cannot accommodate more than 8 electrons, even if it has the capacity to accommodate more electrons ( if , however , the outermost shell of an atom is the first shell or K shell , then it cannot accommodate more than 2 electrons).
(iii) The electrons is an atom do not occupy a new shell unless all the inner shells are completely filled with electrons. This means that first of all the electrons fill K shell , then L shell , then N shell and so on.