Terms from 8th grade chemistry
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| Atom | The basic building block of most ordinary matter.
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| Element | A substance made up of only one type of atom.
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| Nucleus | The center of an atom.
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| Proton | A positively charged subatomic particle.
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| Neutron | A subatomic particle that has no charge.
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| Electron | A negatively charged subatomic particle.
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| Electron Cloud | The area outside the atomic nucleus where electrons are located.
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| Energy Level | The part of the electron cloud where an electron is most likely to be found.
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| Atomic Number | The number of protons in the nucleus of an atom.
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| Neutral | Having no electrical charge.
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| Atomic Mass | The number of protons and neutrons in the nucleus of one atom of an element.
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| Chemical Symbol | A one-or two-letter code used to represent an element.
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| State of Matter | The physical form in which matter exists; solid, liquid, gas, or plasma.
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| Solid | A substance with definite shape and volume.
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| Liquids | A substance that has a definite volume but no definite shape.
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| Gas | A substance that has neither a definite shape nor a definite volume.
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| Plasma | A state of matter that consists of a mixture of electrons and positive ions.
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| Melting point | The temperature at which a liquid begins to change to a solid.
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| Vaporization | The process in which a liquid changes to a gas.
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| Boiling Point | The temperature at which a liquid begins to change to a gas.
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| Condensation | The process in which a gas turns into a liquid.
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| Freezing Point | The temperature at which a liquid begins to change into a solid.
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| Density | The mass of a substance per unit of volume.
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| Physical Property | A characteristic of matter that can be observed or measured without changing the identity of a substance.
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| Chemical Property | A characteristic that determines how a substance will interact with other substances during a chemical reaction.
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| Reactivity | How likely an atom is to react with atoms of other elements to form compounds.
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| Physical Change | A change that alters the physical properties of a substance without changing the identity of the substance.
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| Chemical Change | The changing of one substance into a new substance with different properties.
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| Chemical Reaction | The process by which new substances form during a chemical change.
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| Precipitate | A solid formed by a chemical reaction that takes place in solution.
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| Combustion Reaction | A chemical reaction in which oxygen combines with certain other substances and heat and light are given off.
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