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AP Bio: Chemistry
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Atom: Consists of a nucleus of positively charged protons and neutrally charged neutrons. Negatively charged electrons are arranged outside the nucleus.
Molecules: Groups of two or more atoms held together by chemical bonds.
Electronegativity: Ability of an atom to attract atoms.
Isotopes: One of several atomic forms of an element, each containing a different number of neutrons and thus differing in atomic mass.
Mass
Mass Number: The sum of the number of protons and neutrons in an atom’s nucleus.
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