If the maximum number of electrons in the M (3rd) shell is 18 electrons, i.e. the 3rd shell should accommodate a maximum 18 electrons, then why is the electronic configuration of Calcium 2,8,8,2 and not 2,8,10?

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because  it is ocate form
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because according to shells number it is 2 8 8 18 18 32 and so on not 2 8 18 
thats why
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It is because 3rd shell can accomodate only 8electrons,not more than that.

The shells are designed as 2,8,8,18,32
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31
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