Which of the following pair of elements belongs to the same period?....

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Which of the following pair of elements belongs to
\( \mathrm{P} \)
the same period?
(1) \( \mathrm{Mg} \) and \( \mathrm{Sb} \)
(2) \( \mathrm{Ca} \) and \( \mathrm{Zn} \)
(3) \( \mathrm{Na} \) and \( \mathrm{Ca} \)
(4) \( \mathrm{Ca} \) and \( \mathrm{Cl} \)


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