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the claim
An isobar is chemically and physically identical to an isotope
the verdict
REFUTED
the evidence says no
confidence 0/100

An isobar refers to nuclides of different chemical elements that share the same mass number, whereas an isotope refers to different forms of the same chemical element with varying neutron numbers; therefore, isobars are neither chemically nor physically identical.

Evidence against · 3
Simultaneous Isotopic Analysis of U, Pu, and Am in Spent Nuclear Fuel by Resonance Ionization Mass Spectrometry.
2021 · cited by 0
Paper 1 discusses how mass spectrometry must resolve isobaric interferences between different elements, such as 238U and 238Pu, demonstrating that isobars are different chemical elements with the same mass number rather than identical substances.
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More against · 2
Development of implantation substrates for the collection of radionuclides of medical interest produced via ISOL technique at INFN-LNL.
2021 · cited by 0
Paper 2 notes that radionuclides can be chemically harvested from collected isobars, confirming that isobars are chemically distinct species.
Characterization and first application of a new 236Np spike for (A)MS measurements of 237Np.
2026 · cited by 0
Paper 5 discusses isobaric composition and interferences in mass spectrometry applications, highlighting that different elements or nuclides can share a mass number while retaining distinct chemical identities.
The paper trail · every fact has a biography
first checked01 Aug 2026
judged → REFUTED · 001 Aug 2026
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