The high melting points observed in the transition metals belonging to the 3d, 4d, and 5d series are significant due to the involvement of a greater number of electrons from (n-1)d in addition to the ns electrons in interatomic metallic bonding. The strong metallic bonding results from the effective overlap of d orbitals, contributing to a robust crystal lattice. In any row, the melting points of these metals rise to a maximum at d⁵, except for anomalies like Mn and Tc. This phenomenon indicates that having one unpaired electron per d orbital is particularly favorable for strong interatomic interaction, explaining the high melting points observed in the transition metal series.