Question

The elements of the three transition series of the d - block are given below:
$\begin{array}{cccccccccc}& & & & & & & & & \\ Sc& Ti& V& Cr& Mn& Fe& Co& Ni& Cu& Zn\\ Y& Zr& Nb& Mo& Tc& Ru& Rh& Rd& Ag& Cd\\ La& Hf& Ta& W& Re& Os& Ir& Pt& Au& Hg\end{array}$
In any transition series, as we move form left to right, the d - orbitals are progressively filled and their properties vary accordingly.
Which element do you expect to have the highest melting point?

• A. La
• B. W
• C. Os
• D. Pt

Answer 1

The correct option is B W

Look for the one having the strongest metallic bonding. Again, this is a function of the number of unpaired electrons! $W$ tops the list here and thus has the highest melting point.