What happens to the melting point of d-block elements across a period?

The melting point of transition elements increases to a maximum at d5 and decreases with the increase of atomic number across a period.

  • The transition metals are characterized by partially filled d & subshells in the free elements and cations.
  • The ns and (n − 1) d subshells have similar energies, so small influences can produce electron configurations that do not conform to the general order in which the subshells are filled.
  • The group 4 metals become denser, higher melting, and more electropositive down the column.
  • The trends in boiling and melting points vary from group to group, based on non-bonding interactions holding the atoms together.

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