Chemistry, asked by alamnoman9p, 2 days ago

plz give me the ans

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Answered by Oyevarshu

1

Explanation:

Ca, Cr, Zn belong to same period.

Helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and oganesson (Og) belong to 18 group.

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