As compare to s and p block elements melting point of d block element is quit___
Answers
All elements of d-block are high melting solids i.e. they generally have melting points above 900 ºC except zinc (419 ºC), Cadmium (321 ºC) and mercury (–38 ºC). The high melting points of
d block elements is based the strong metallic bonding between their atoms. Higher is the number of unpaired electrons, stronger will be the metallic bond and thus higher will be the melting point.
On moving left to right in a transition series, the number of unpaired elections increase up to d5 configuration, thus strength of metallic bond increases and melting point also increases.
So, in first transition series, the melting points increase from Sc to Cr and then Mn shows anomalous low melting point as shown in the graph. The exceptionally low melting point of Mn (3d54s2) is understood in terms of its weak metallic bonding due to non-participation of 3d electrons in metallic bonding. On moving further, the melting points decrease regularly due to decrease in the number of unpaired electron as pairing starts from d6 system (Fe).