Examlex
The very earliest factories were often staffed by entire ____________________.
Neutrons
Neutral particles found in the nucleus of an atom, contributing to the atom's mass but not its charge.
Protons
Positively charged subatomic particles found in the nucleus of an atom.
Amu
Atomic Mass Unit, a unit of mass used to express atomic and molecular weights, equivalent to one twelfth of the mass of a carbon-12 atom.
Valence Shells
The outermost shell of electrons in an atom, which determines how the atom interacts chemically with other atoms.
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