Atoms {isotope}| can have same number of protons but different numbers of neutrons. Element isotopes have same physical properties, except for mass differences.
Most isotopes are not radioactive, such as 2H [2 is superscript] {deuterium}.
Isotopes {radioactive isotope}| can be radioactive. Tritium is 3H [3 is superscript]. Carbon-14 is 14C [14 is superscript]. Nitrogen-15 is 15N [15 is superscript]. Phosphorus-32 is 32P [32 is superscript]. Sulfur-35 is 35S [35 is superscript]. Strontium-90 is 90Sr [90 is superscript]. Uranium-235 is 235U [235 is superscript]. Plutonium is 239Pu [239 is superscript].
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Date Modified: 2022.0225