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A basic unit of matter consisting of a dense central nucleus surrounded by a cloud of negatively charged electrons.
Different forms of the same element that has nuclei with the same number of protons but different numbers of neutrons.
A subatomic particle with no net electric charge and a mass slightly larger than that of a proton.
A type of chemical bond that often forms between metal and nonmetal ions through electrostatic attraction.
An atom or molecule that has lost or gained one or more electrons, giving it a positive or negative electrical charge.
A form of chemical bond characterized by sharing of pairs of electrons between atoms, or between atoms and other covalent bonds.
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