page_title: Isobar (nuclide)
hierarchical_section_title: Isobar (nuclide)
caption_attribution_description: English: Map of nuclides, chart of nuclides &#160;&#160; alpha decay &#160;&#160; stable nuclide &#160;&#160; beta+/EC decay &#160;&#160; beta- decay &#160;&#160; proton decay &#160;&#160; spontaneous fission &#160;&#160; neutron emission Deutsch: Nuklidkarte Français&#160;: Carte des nucléides Polski: Tabela nuklidów Svenska: Nuklidkarta
context_page_description: Isobars are atoms of different chemical elements that have the same number of nucleons. Correspondingly, isobars differ in atomic number but have the same mass number. An example of a series of isobars would be ⁴⁰S, ⁴⁰Cl, ⁴⁰Ar, ⁴⁰K, and ⁴⁰Ca. While the nuclei of these nuclides all contain 40 nucleons, they contain varying numbers of protons and neutrons.
  The term "isobars" for nuclides was suggested by Alfred Walter Stewart in 1918. It is derived from the Greek word isos, meaning "equal" and baros, meaning "weight".
context_section_description: Isobars are atoms (nuclides) of different chemical elements that have the same number of nucleons. Correspondingly, isobars differ in atomic number (or number of protons) but have the same mass number. An example of a series of isobars would be ⁴⁰S, ⁴⁰Cl, ⁴⁰Ar, ⁴⁰K, and ⁴⁰Ca. While the nuclei of these nuclides all contain 40 nucleons, they contain varying numbers of protons and neutrons.
  The term "isobars" (originally "isobares") for nuclides was suggested by Alfred Walter Stewart in 1918. It is derived from the Greek word isos, meaning "equal" and baros, meaning "weight".
caption: In this chart of nuclides, isobars occur along diagonal lines running from the lower right to upper left. The line of beta stability includes the observationally stable nuclides shown in black; disconnected 'islands' are a consequence of the Mattauch isobar rule.
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