Plot the melting temperatures of elements in the 4A to 8–10 columns of the periodic table versus atomic number (i.e., plot melting temperatures of Ti through Ni, Zr through Pd, and Hf through Pt). Discuss these relationships, based on atomic bonding and binding energies: 

(a) As the atomic number increases in each row of the periodic table and 

(b) As the atomic number increases in each column of the periodic table.