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

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Which of the following pair of elements belong to the same period?
\( \mathrm{P} \)
(a) \( \mathrm{Mg} \) and \( \mathrm{Sb} \)
(b) \( \mathrm{Ca} \) and \( \mathrm{Zn} \)
(c) \( \mathrm{Na} \) and \( \mathrm{Ca} \)
(d) \( \mathrm{Ca} \) and \( \mathrm{Cl} \)
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