according to bohr's theory of distribution of electrons in orbits M shell can accomodate 18 electrons ( by 2n2 )but we can not draw more than 8 electrons in M shell ) why ? and similarly in N shell , it can accomodate 32 electrons but we are allowed to draw only 2 electrons.? please help its urgent .

Asked by  | 17th Nov, 2012, 03:28: PM

Expert Answer:

According to Bohr's theory of distribution of electrons, the outermost shell of an atom cannot accomodate more than 8 electrons, even if it has the capacity to hold more electrons. For example in case of Magnesium; its atomic number is 12 so the electronic configuration will be: K-2, L-8, M-2. Now L shell has maximum capacity of 8 electrons only so, the 2 electrons left will go to M shell though it has tendency to hold more electrons. In case of Calcium, it belongs to S-block and has the electronic configuration 1s22s22p63s23p64s2  
i.e. it has 4 shells in it so its configuration is: K-2, L-8, M-8, N-2; although M shell can accomodate upto 18 electrons.

Answered by  | 19th Nov, 2012, 11:36: AM

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