Question

Give reason : The third period contains only 8 elements even though the electron capacity of the third shell is 18​

Answer 1

Answer:

Explanation:

Actually 3rd shell should contains 18 elements but there are 10 electrons which are found to have high energy equivalent to energy of 4th shell. So these electrons are not counted in the 3rd shell. Hence, only 8 electrons are in 3 rd shell resulting 2, 8, 8, 18,

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