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Valence Electrons
The electrons in the outermost shell of an atom that are involved in forming chemical bonds.
Sulfur
A chemical element with the symbol S, known for its importance in biological organisms and its role in various chemical compounds.
Isotopes
Isotopes are variants of a particular chemical element which differ in neutron number, and consequently in nuclear mass, yet retain their identity as that element.
Neutrons
Subatomic particles found in the nucleus of an atom, with no electric charge and a mass slightly larger than that of protons.
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