Question

Mn and Tc first and second transition series respectively has low melting point why?​

Answer 1

Answer:

Manganese has 5 free electrons in its d orbital so it take place more in metallic bonding as compared to other elements in its neighborhood (left and right in periodic table) who have 4 free electrons in their d orbital. More metallic bonding means more energy requires in breaking bond and more melting point.

Answer 2

Explanation:

The high melting and boiling points of d-block 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.