Select the chemically similar pair of elements. a. \( \mathrm{Na} \) and \( \mathrm{K} \) b. \( ...

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Select the chemically similar pair of elements.
a. \( \mathrm{Na} \) and \( \mathrm{K} \)
b. \( \mathrm{Ba} \) and \( \mathrm{Sr} \)
c. \( \mathrm{Zr} \) and \( \mathrm{Hf} \)
d. \( \mathrm{Ca} \) and \( \mathrm{Cr} \)
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