The  number of electrons that can be accommodated in the m,n orbit is eight ....but why as m can hold 16 and n 32....

The maximum number of electrons that can be accommodated in a shell is given by the formula 2n2, where n denotes the shell number. Thus, since for the K shell, n = 1, hence the maximum number of electrons that can be accommodated in the K shell is 2 X (1)2 = 2. Similarly, the L shell can accommodate a maximum of 8 electrons, while the M and the N shell can accommodate a maximum of 18 and 32 electrons respectively. 

If, however, a given shell is the outermost shell, it cannot hold more than 8 electrons. For example, the M shell can hold a maximum of 18 electrons, but if it is the outermost shell, then it cannot hold more than 8 electrons. Similar is the case with the N shell. It has the capacity to hold maximum of 32 electrons. But if it is the outermost shell, then it cannot hold more than eight electrons. 

A detailed explanation of this rule and how it arises is beyond the scope of discussion at this stage. In grade 11, you will study about electronic configuration of elements in more detail. You will come across many other terms such as subshell, orbitals etc. 

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when it is referred to an ion the maximum no. of electrons in the last orbit would be maximum eight because if it has more or less than that it will gain or lose electron when combining with other. While when it is referred to an atom the maximunm electrons in m is 16 nad n is 32.

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According 2n2 (n=nos of orbit) rule m orbit i.e thrid orbit can hold 2*3*3=18 electrons and n electron i.e forth orbit can hold 2*4*4=32 electrons but according to octact rule any orbit is electrolly stable if the outermost orbit has 8 electrons

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