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Types of Crystalline Solids

Which triad b...

Question

Which triad belongs to the same group and same period?

A

C u, A g, A u

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B

F e, C o, N i

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C

Z n, C d, H g

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D

None of these

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Solution

The correct option is A $F e, C o, N i$
$F e, C o, N i$ all belong to $4 t h$ period and VIIIB group.
$F e (26)$
$C o (27)$
$N i (28)$
They are called iron triads.

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