The maximum number of electrons present in a shell is given by the formula 2n sq ,where 'n' is the orbit number. Hence the maximum number of electrons in different shells are as follows: the first orbit will be equal to 2x1sq =2, second orbit will be =2x2 sq =8, third orbit will be 2x3sq =18, fourth orbit will be =2x4sq =32 and so on.
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The electrons are distributed in shells or fixed orbits.Electronic configuration refers to the distribution of electrons in different shells.Each shell has a limited capacity to hold electrons and each electron tries to occupy a shell which has minimum energy.Factors which govern the distribution of electrons are:-
Rule one-The maximum number of electrons which can be present in any shell of an atom is given by or represented by a formula 2n to the power 2.(where n is equal to the number of the shell as counted from the nucleus).
Rule 2- The outermost shell cannot have more than 8 electrons.
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