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smallest unit of matter

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Cannot be broken down into any other simpler substance

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2 or more elements chemically combined

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a combination of two or more different kinds of matter keeping its own properties

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Atoms are made up of protons and neutrons.

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Elements are formed in stages range from oxygen through to iron.

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Atoms of different elements can join together in chemical reactions to form compounds. For example hydrogen and oxygen are elements. They react together to form water, a compound.

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Mixing and combining different things

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the number of electrons is equal to the number of protons and it make atoms electrically neutral..

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Their number of electrons and protons. Also each element is represented by a unique symbol. The notation for each element can be found on the periodic table of elements.

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Metals often react with nonmetals to form ionic compounds. Their either positive and negative ions formed by adding or subtracting electrons from neutral atoms and molecules.

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a mixture can be separated by physical means because they have different physical properties (such as different melting points) and are not chemically bonded.