Na has one valence electrons while copper has nine outer electrons.Electron sea in sodium lattice is less than copper lattice.Hence strong metallic bonding in copper will make it harder from sodium.
Both sodium and copper possess free electrons due to which both are good conductors of electricity.
Sodium is softer than copper but both are good conductors of electricity ?
![Sodium is softer than copper but both are good conductors of electricity ?]()
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Another reason is Due to covalent bonding arising from d orbital of Cooper make it harder than sodium.
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