Question

Why are transition elements called so?

A. 

Variable valency

B. 

Having different colors

C. 

Constant valency

D. 

None of these

E. 

Both A and B​

Answer 1

Answer:

(A) Variable valency

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Answer 2

Answer:

The ability of the transition metals to exhibit variable valency is generally attributed to the availability of more electrons in the (n−1)d orbitals which are closer to the outermost ns orbital in energy levels