Direction (Q. Nos. 19 and 20) This section contains 1 paragraph, which describing theory, experiments, data, etc. Two questions related to the paragraph have been given. Each question has only one correct answer among the four given options (a), (b), (c) and (d).
The following pictures show the electrons population of the composite s-d bands for three transition metals :
Metals with the highest and lowest melting points respectively are