Which of the following pair of elements have same number of shells?

Ca, Ba

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Na, Al

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K, Sr

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O, Cl

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Solution

The correct option is C Na, Al
Sodium and aluminium belong to same period, i.e. $3^{r d}$ period and the elements have same number of shells.

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Identify the pair of elements from among the following which have the same number of valence electrons.

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