Explain why the metallic bonds in some metals are stronger than bonds in other metals?
The physical properties of different metals may be rationalized on the basis of intrinsic nuclear charge and number of valence electrons.
Metallic bonding accounts for the physical properties of metals: malleability; ductility; electrical and thermal conductivity; lustre.
Some metals have more valence electrons to contribute to the metallic network. The alkali metals have only the 1 valence electron to the metallic lattice, and these are low melting solids and liquids.