1.Elements are classified as metals,non metals and inert gases
2. zigzag elements lie on the left of the periodic table and they are metals
3.compounds are described by definite sets of properties they posses and their constituents of elements , so they are described by formulas in various formats
4.Compounds are combination of 2 or more chemical elements or atoms,eg CO2, its made with more than one element
5. Compounds are pure substances , made of atoms of two or more elements.
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