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Cards In This Set
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Element
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Any substance that cannot be broken down to any other substance by chemical reactions.
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Compound
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A substance consisting of two or more different elements combined in a fixed ratio.
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Trace Elements
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An element indispensable for life but required in extremely minute amounts.
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Atom
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The smallest unit of matter that retains the properties of an element.
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Electrons
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A subatomic particle with a single negative electrical charge and mass about 1/2,000 that of a neutron or proton.
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Neutrons
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A subatomic particle with no electrical charge (neutral) w/ a mass of about 1.7 x 10 raised to -24 g in the nucleus.
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Protons
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A subatomic with a positive chargew/ a mass of about 1.7 x 10 raised to -24 g in the nucleus.
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Atomic Nucleus
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An Atom's dense central core, containing protons and neutrons.
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Dalton
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A measure of mass for atoms; same as the atomic mass unit, or amu
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Atomic Number
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The number of protons in the nucleus of an atom; unique for each element.
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Mass Number
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The sum of the number of protons and neutrons in an atom's nucleus.
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Atomic Mass
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The total mass of an atom, which is the mass in grams of 1 mole of the atom.
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Isotopes
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One of several atomic forms of an element w/ the same # of protons, but different # of neutrons; differing in atomic mass.
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Radioactive Isotopes
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An isotope that is unstable; the nucleus decays spontaneously, giving off detectable particles and energy.
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Energy
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The capacity to cause charge, especially to do work (to move matter agaist an opposing force).
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