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15 Cards in this Set
- Front
- Back
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Electron shells
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An orbit of electrons around the nucleus of an atom
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Halogens
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Group 17 elements in the periodic table; the most reactive metals
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Conservation of mass
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the principle that matter is not created or destroyed in a chemical reaction. The mass of products always equals the mass of reacton.
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Compound
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chemical combination of two or more elements in a specific ratio
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Alkali Metals
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Group 1 elements in the periodic table, not including hydrogen; the most reactive of metals.
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Metals
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shiny, malleable, ductile element that conducts electricity.
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Mass Number
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Th sum of the number of of protons and neutrons in an atom
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Ion
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An atom that becomes electrically charged because it lost or gained electrons.
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Phyiscal change
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The change in the apperance or stateof a substance that does not change its composition
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Atomic mass
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the mass of one atom of an element calculated from the number of protons.
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Ionic compounds
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Pure substance formed when at least one metal and one non-metal combine.
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Atomic mass unit
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the measure of atomic mass; 1 amu is equal to 1/12th the mass of a carbon 12 atom
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chemical change
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change that results when two or more substances react to create a different substance or substances.
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Noble gases
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Group 18 element in the periodic table; the most stable and least reactive elements
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Cellular respiration
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A chemical reaction that takes place in cells; food reacts with oxygen to produce energy, water, and carbon dioxde.
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