Examlex
Solve the system by the addition method.
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Atom
The basic unit of a chemical element, consisting of a nucleus of protons and neutrons, with electrons orbiting the nucleus.
Amu
Atomic Mass Unit, a standard unit of mass that quantifies mass on an atomic or molecular scale.
Valence Electrons
Electrons in the outermost shell of an atom that are available for bonding with other atoms.
Atomic Number
The number of protons in the atomic nucleus of an atom, which uniquely identifies the element to which the atom corresponds.
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