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An atom is a particle that consists of a nucleus of protons and neutrons surrounded by an electromagnetically-bound cloud of electrons. The atom is the basic particle of the chemical elements.

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The term matter refers to anything that occupies space and has mass, the 4 states of matter are Solids, Liquid, Gas, Plasma.

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A chemical element is a chemical substance that cannot be broken down into other substances. The basic particle that constitutes a chemical element is the atom, and each chemical element is distinguished by the number of protons in the nuclei of its atoms, known as its atomic number.

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An atom or group of atoms that carries a positive or negative electric charge as a result of having lost or gained one or more electrons see anion, cation.

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Oxidation is a process in which a chemical substance changes because of the addition of oxygen. For example let's say a car is left outside for to long, its starts to rust.

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Electrons in the outermost shell of an atom, and that can participate in the formation of a chemical bond if the outermost shell is not closed.

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The line of separation between metals and nonmetals is the zigzag. All Non metals are to the right, all metals are to the left.

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A group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.

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A chemical compound is a chemical substance composed of many identical molecules containing atoms from more than one chemical element held together by chemical bonds.

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Compounds made up of ions that form charged particles when an atom (or group of atoms) gains or loses electrons.

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A way of presenting information about the chemical proportions of atoms that constitute a particular chemical compound or molecule.

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A molecular compound consists of molecules whose formula represents the actual number of atoms bonded together in the molecule

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The symbolic representation of a chemical reaction in the form of symbols and chemical formulas.

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An uncharged atomic particle that has a mass nearly equal to that of the proton, helps make up the center of the atom or known as the nucleus.

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The other half that makes up the nucleus, the proton is a subatomic particle with a positive electrical charge

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An elementary particle that has a negative charge of electricity and travels around the nucleus of an atom.

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The columns on the periodic table.

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Rows on the periodic table.

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Number of protons in the nucleus of an atom.

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The number of protons and neutrons in the atom.

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A particle smaller than an atom.

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Atoms with the same number of protons but different numbers of neutrons