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yes according to Bohr's model the third shell i.e. M shell contains 18 electrons ..... but it holds only 8 electrons ..
i hope it helps...........
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Yes it can beacause if element has more electrons we can add 18 electrons in third cell.
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ss...according to electronic configuration the formula is written as 2n square...therefore the third shell must have 18 electrons 
according to law of obtet we can fill 2 electrons in firsr cell.According to law of octet we can fill 8 electrons in rest of the cells.
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