Question

how can we justify that common salt is a compound​

Answer 1

Something like table salt (NaCl) is a compound because it is made from more than one kind of element (sodium and chlorine), but it is not a molecule because the bond that holds NaCl together is an ionic bond. If you like, you can say that sodium chloride is an ionic compound.

Answer 2

Answer:

Sodium chloride also known as table salt, is an ionic compound with the chemical formula NaCl, representing a 1:1 ratio of sodium and chloride ions. ... Salt can be created by adding two very reactive elements together: sodium (Na(s) metal and chlorine (Cl2(g) gas.

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