choose from the following:
₆C, ₈O, ₁₀Ne, ₁₁Na, ₁₄Si
(i) elements that should be in the sameperiod.
(ii) elements that should be in the same group.
state reasons for ur selection in each case.

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Solution

Electronic configuration:
C – 2, 4
O – 2, 6
Ne – 2, 8
Na – 2, 8, 1
Si - 2, 8, 4
Elements in which electrons are filled in first 2 shells: C, O and Ne. So these elements lie in the same period.
Elements in which electrons are filled in first 3 shells: Na and Si. So these elements lie in the same period.
Elements with same number of valence electrons: C, Si. So, these elements lie in the same group.

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