explain why the element in third period is 8
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the element in third period is 8
because the maximum number of electron which can be put in second shell of an atom is 8
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The number of shells indicates the period number. And the number of elements in each period is calculated by the formula 2n^2 ( which is also used to calculate the maximum number of electrons that a shell can afford )
By the formula , in third period we should find 18 elements. [as 2×3^2 = 2×9 = 18 ]
But there are only 8 elements in the period because an atom is stable if it has 8 electrons in its valence shell [except period 1 elements as it can be stable if there are 2 electrons in its valence shell ]
That is the reason why we can find only 8 elements in third period.
Hope this will help you.
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