Which family in the periodic table has metals that are usually harder than other metals? Alkali metals
Alkaline earth metals
Lanthanide series
Transition metals

Transition metals

Explanation:

The transition metals are usually harder than other metals such as the alkali metal, lanthanide series metals and the alkaline earthmetals.

The reason for this is because they have a stronger metallic bonding between their atom.

Hardness is a physical property which is attributed to intermolecular forces and the atomic arrangement

The transition metals are found in the d - block on the periodic table.

They have a d-orbirtal which confers extra electrons and higher degree of stability to the atom. The d-orbirtal provides more delocalized electrons for the metallic bonds formed.

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its temperature is increasing. this causes molecular vibrations to increase.