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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