salt is a compound of sodium and chlorine explain that salt has different properties than it's constituent element 

Dear Student,

Salt i.e. NaCl is formed by combination of Na and Cl2. It is a compound and a compound is formed by chemical reaction between two or more elements such that the properties of the formed compound is different from its constituent elements. 
NaCl is a salt whereas Na is a metal and Cl is a non-metal. 
NaCl is a crystalline solid, whereas Cl‚Äč2 is a gas. 
Na reacts with water exothermically whereas, NaCl doesnot react with water. 

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A compound is a substance formed when two or more elements are chemically joined. Water, salt, and sugar are examples of compounds. When the elements are joined, the atoms lose their individual properties and have different properties from the elements they are composed of.
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