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14 terms

Science Test 2/3/09

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Matter
any substance that takes up space and has mass
Molecules
smallest part of a compound
Compound
made up of two or more elements
Rows
How many electron shells
Columns
How many valence electrons are in the last valence shell
Atomic #
# of protons
Atomic Mass
# of protons + # of neutrons
# of Neutrons
# of protons - atomic mass
Inert
Having no inherent power of action, motion, or resistance
Isotope
Variation in an atom of an element with different # of neutrons
Ions
When an atom or molecule loses or gains an electron so that it becomes a charged particle
Ionic Bond
Attraction of opposite charged ions
Covalent Bond
Atoms sharing electrons
Polar Bond
Between opposite poles of polar molecules