Examlex
The expression instructs us to ________.
Isotope
Atoms of the same element that have different numbers of neutrons, resulting in different masses but similar chemical properties.
Neutrons
Electrically neutral subatomic particles found in the nucleus of an atom, contributing to the atomic mass but not the atomic charge.
Protons
Positively charged particles found in the nucleus of an atom, contributing to the atom's mass and defining its element by determining the atomic number.
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