In general the melting and boiling points of transition metals

Options

A. increases gradually across the period from left to right.
B. decrease gradually across the period from left to right .
C. first increases till the middle of the period and then decrases towards the ends.
D. first decreases regulary till the middle of the period and then towards the end .

Answer

C

Explanation

First increases till the middle of period and then decrease towards the end as the atomic no. increases point.
As unpaired d-orbitals electron pair up, the M.P decrease
There is a very small energy difference between .