Question

Elements of which block generally show maximum variation in valency

Answer 1

Explanation:

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The following blocks of elements show maximum variation in valency:

The valency of atoms of s-block and p-block elements are generally given as the number of valence electron or eight minus the number of valence electrons. Whereas, in d-block and f-block elements valency is determined not only on the basis of valence electrons but also on d and f orbital electrons.