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any substance that takes up space and has mass


smallest part of a compound


made up of two or more elements


How many electron shells


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


Having no inherent power of action, motion, or resistance


Variation in an atom of an element with different # of neutrons


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

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