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the sum of the number of protons and neutrons (the nucleons) in the nucleus of an atom. It determines the mass of the element.
the radius of an ion of an atom, from the nucleus to the outermost.
a group of organic compounds in which a halogen has replaced a hydrogen atom.
a solution to which a little acid has been added to a lot of water.
a reaction in which a small atom or molecule is removed or eliminated from a larger molecule....
a process that releases energy from the system. This decreases the internal energy of the system...