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11 Cards in this Set
- Front
- Back
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element
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a substance that cannot be broken down into other substances by chemical reaction
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compound
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a substance consisting of two or more different elements combines in a fixed ratio
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essential element
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a chemical element required for an organism to survive, grow, and reproduce
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trace element
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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 that element
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neutrons
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a subatomic particle having no electrical charge (electrically neutral) with a mass of about 1.7x10^-24g. Found in the nucleus of an atom
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protons
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a subatomic particle with a single positive electrical charge, with a mass of about 1.7x10^-24g. found in the nucleus of an atom.
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electrons
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a subatomic particle with a single negative charge and a mass of about 1/2,000 that of a neutron or proton. One or more electrons move around the nucleus of an atom.
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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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atomic mass unit
1.6605x10^-27g |
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atomic number
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the number of protons in the nucleus of an atom unique for each element and designated by a subscript to the left of the elemental symbol
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