Question

who is different from us sodium zinc chloride calcium​

Answer 1

as they have different chemical name and reaction

Answer 2

Chloride is the different one.

1. The mentioned names, except chloride are all elements.
2. Chloride is an ion, anion to be specific. It is an anion of chlorine.
3. Chlorine is an halogen present in seventh group of periodic table.
4. The formation of chloride ion takes place when chlorine gains an electron, completing it's octet.
5. The symbol representing chloride ion is Cl-.