Question

The third period contains only eight elements even though the electron capacity of the third shell is 18

Answer 1

here is ur ans bro
ans- AS per the electron holding capacity of shells 2 elements are present in the first period and 8 elements in the second period.
The third period also contains only eight elements due to the law of electron octet. There are few more factors which control the filling of electrons in the subsequent periods which will be considered in the next standards.
therefore, the third period contains only eight elements even through the electron capacity of the third shell is 18.







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