Matter (6.5) Vocabulary

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Atom

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Basic building block of all matter

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Subatomic Particles

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Particles that make up an atom (electrons, protons, neutrons)

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Element

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Form of matter made up of one type of atom

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Chemical symbol

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A representation of an element usually consisting of one or two letters (examples: C, O, Na, Fe, Al)

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Compound

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Substance formed by the combination of two or more different elements (examples: NaCl, CaO, H2O, CH4)

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Chemical bonds

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Forces that hold atoms together to form new substances; form when an atom shares electrons with another atom, or when electrons are transferred from one atom to another

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Chemical formulas

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Representation of a compound using element symbols and subscripts (examples: NaCl, H2O, C6H12O6, HCl)

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Chemical equations

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A way to show a chemical reaction using symbols instead of words (example: Na + Cl → NaCl)

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Electron

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Subatomic particle which moves around the outer sphere (shell) of an atom, has a negative electrical charge

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Neutron

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Subatomic particle in atom’s nucleus, has no electrical charge