according to Bohr bury model of atom , k shell should have 2 electrons, l shell should have 8 electrons , m shell should have 18 electrons . then according to it electronic configuration of calcium should be 2,8,10 but in actual the electronic configuration of calcium is 2,8,8,2. Why is it so ?

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Solution

K - shell has maximum of 2 electrons
L- shell can have 8 electrons .
M- shell can have maximum 18 electrons.
M - shell can have 8 electrons as total electrons should have 18 electrons = 2+ 8+ 8 = 18 electrons
So, calcium has an electronic configuration of 2,8,8,2.
M -shell has a capacity to accomodate 8 electrons.

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