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Question

The maximum number of electrons present in an atom whose highest principal quantum no.  is 4  is 32 How?

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Solution

The maximum number of electrons that can be added on the fourth energy level is equal to 32, not the maximum number of electrons that an atom can hold up and including the fourth energy level.
There is a formula for obtaining the maximum number of electrons for each shell which is given by 2n2 where n is the position of a certain shell.
By the formula when n= 4 the max electrons are 2*16= 32...
Hope it helps
 

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