Sodium chloride is hard but sodium metal is soft why
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as the sodium alone is soft ....but when made into compound with chloride becomes hard as nature of the substance differ in elements and compounds ....
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Explanation:
In sodium metal there is weak metallic bonding in the sodium because it has only one valence electron. Hence, sodium metal is soft.
Whereas sodium chloride is present in crystal form and it has ionic bond as sodium atom has transferred one electron to the chlorine atom.
Therefore, sodium chloride has strong bonding between sodium and chlorine atoms. As a result, sodium chloride is hard.
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