When elements combine to form compounds,their properties only change slightly.

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When elements combine to form compounds, their properties can change significantly due to the new chemical bonds formed and the different arrangement of atoms in the compound. For example, sodium (a highly reactive metal) and chlorine (a poisonous gas) combine to form sodium chloride (table salt), which has completely different properties from its constituent elements.

When Elements Combine to Form Compounds,their Properties Only Change Slightly