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Cards In This Set
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Chemistry
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The study of matter
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Matter
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Anything that has mass and occupies space.
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Element
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A substance that cannot be broken down to other substances by chemical reactions.
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Compound
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A substance consisting of two or more elements in a fixed ratio.
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Atom
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Smallest unit of an element; composed of subatomic particles (protons, neutrons, electrons).
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Proton
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Positively charged.
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Neutron
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No charge.
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Electron
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Negatively charged.
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Atomic Number
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Number of protons.
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Atomic Mass
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Sum of protons and neutrons.
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Isotope
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Atoms of the same element that differ in the number of neutrons (have different atomic masses); some spontaneously decay.
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Radioactive Isotope
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Give off energy in the form of rays and subatomic particles (used as diagnostic tools in medicine, as radioactive tracers in the study of ecosystem dynamics, and as a measure for dating fossils and other artifacts).
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Electron Shell
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Orbitals where electrons revolve around the nucleus.
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Valence Shell
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The outermost electron shell.
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Ions
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What atoms that gain or lose electrons become (electronically charged).
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