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15 Cards in this Set
- Front
- Back
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Matter
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Anything that takes up space or has mass.
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Atom
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The smallest unit of matter that still retains the properties of an element.
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Electron
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Subatomic particle, orbiting the nucleus, with negligable mass and a negative charge.
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Atomic Mass Number
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The number of protons and neutrons in the nucleus of an atom.
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Energy Level
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Any of several different states of potential energy for electrons in an atom.
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Valence Electron
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An electron in the outermost shell.
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Covalent Bond
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A type of strong chemical bond in which two atoms share one or more pairs of valence electrons.
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Electronegativity
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The attraction of an atom for the electrons of a covalent bond.
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Polar Covalent Bond
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A covalent bond between atoms that differ in electronegativity. The shared electrons are pulled closer to the more electronegative atom, making it slightly negative and the other atom slightly positive.
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Anion
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A negatively charged ion.
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Element
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Any substance that cannot be broken down to any other substance.
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Neutron
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An electrically neutral particle (a particle having no electrical charge), found in the nucleus of an atom.
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Atomic Nucleus
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An electrically neutral particle (a particle having no electrical charge), found in the nucleus of an atom.
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Electron Shell
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An energy level represented as the distance of an electron from the nucleus of an atom.
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Valence Shell
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The outermost energy shell of an atom, containing the valence electrons involved in the chemical reactions of that atom.
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