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Sodium metal is soft with low melting point and low heat of fusion because metallic bond is week. Sodium metal has 1 valence electron per atom,

THE METALLIC BOND IS WEEK therefore it is not very strong so, SODIUM METAL IS SOFT..

OTHER metals are hard because they have strong metallic bonding,

These metals have high melting point because they have incomplete valence shell ,

As a result strong covalent bond between atom extends through out the crystals so,

THEY'RE HARD METALS.

(ANSWER FROM TAZEEM HAJRA)

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