Isotopes
Explore known isotopes by element: stability, natural abundance, half-life, decay mode and nuclear spin.
—Z
—Σ Isotopes
—Stable
—Natural
Isotopes
Z–N
N — neutrons Z — protons
Each square represents an isotope, defined by its number of protons Z and neutrons N. Along a horizontal line, the element stays the same and only the number of neutrons changes; the mass number is A = Z + N. Stable isotopes form a band of stability, while nuclei around it are radioactive and transform by decay.
StableRadioactiveNatural