4 1 depicts the melting points of
transition metals belonging to 3d, 4d and 5d
series The high melting points of these metals
are attributed to the involvement of greater
number of electrons from (n-1)d in addition to
the ns electrons in the interatomic metallic
bonding In any row the melting points of these
metals rise to a maximum at d
5 except for
anomalous values of Mn and Tc and fall
regularly as the atomic number increases