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atoms that are held together by covalent bonds
atoms that have lost or gained electrons
subatomic particle without a charge; found in nucleus
a covalent bond in which four valence electrons are shared between two atoms
atoms having the same numbers of protons but different numbers of neutrons
shows the number and types of atoms in a molecule and how they are arranged
substance containing two or more elements chemically combined in a fixed ratio
interaction of substances that lead to the formation of new substances
subatomic particle having a positive charge; found in nucleus
an unstable atom in which the nucleus decays (breaks down) releasing particles and energy