atom element and compoun
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Compounds are made of two or more atoms of different elements, such as water (H2O) and methane (CH4). Atoms are not drawn to scale. Molecules of compounds have atoms of two or more different elements. For example, water (H2O) has three atoms, two hydrogen (H) atoms and one oxygen (O) atom.
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atom is a smallest unit of ordinary matter that forms a chemical element.
a substance that cannot be broken down into similar substances by chemical.
a compound is a substance that formed when two or more chemical elements are chemically bonded together.
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