why nacl is harder than sodium metal
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Sodium chloride is an ionic compound which is formed by the attraction of oppositely charged particles and hence there occurs strong forces of attraction thus forms hard crystalline solid while sodium is a metal which involves metallic bonding which of course is weaker than ionic bonding in sodium chloride.
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NaCl is made of ionic bonds. So the force of attractions among atoms is greater. So it is much harder than sodium metal
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