--- title: Even Chemical Bonds Obey Einstein’s Relativity | daily.dev description: Brown University scientists have measured relativistic effects in chemical bonds at the atomic scale, specifically in bismuth-carbon triple bonds. The research... canonical: https://daily.dev/posts/even-chemical-bonds-obey-einstein-s-relativity-ap9wx4yag twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Even Chemical Bonds Obey Einstein’s Relativity | daily.dev og:description: Brown University scientists have measured relativistic effects in chemical bonds at the atomic scale, specifically in bismuth-carbon triple bonds. The research... og:url: https://daily.dev/posts/even-chemical-bonds-obey-einstein-s-relativity-ap9wx4yag og:image: https://api.daily.dev/og/posts/AP9wX4yag.png og:image:alt: Even Chemical Bonds Obey Einstein’s Relativity og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Even Chemical Bonds Obey Einstein’s Relativity **[Hackaday](https://daily.dev/sources/hackaday)** · 2 min read · 0 upvotes · 0 comments ## Summary Brown University scientists have measured relativistic effects in chemical bonds at the atomic scale, specifically in bismuth-carbon triple bonds. The research challenges the conventional sigma-pi triple bond model, showing that heavy elements like bismuth-209 (atomic number 83) cause relativistic effects that blur the distinction between sigma and pi bonds into a hybrid bond type. This hybrid bond is effectively stronger than standard triple bonds between lighter elements, with implications for our understanding of bond strength in heavy element chemistry. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### How do relativistic effects change chemical bonds in heavy elements like bismuth? In heavy nuclei such as bismuth-209 (atomic number 83), relativistic effects cause the traditionally distinct sigma and pi bonds in a triple bond to blend into a hybrid bond type. Brown University researchers demonstrated this using photoelectron spectroscopy to measure bond strength in a bismuth-carbon triple bond, finding the effect makes the bond stronger than the conventional sigma-pi model would predict, since pi bonds are normally weaker than sigma bonds. _Curious readers exploring how physics reshapes chemistry basics can follow research breakdowns like this on daily.dev._ ### Does the standard sigma-pi model of triple bonds still apply to lighter elements? Yes, the conventional model of triple bonds having a distinct sigma bond and two pi bonds still holds for lighter atomic nuclei. The breakdown into a hybrid bond only becomes significant when enough atomic mass is present to produce measurable relativistic effects, as demonstrated with the heavy bismuth-209 nucleus in a bismuth-carbon triple bond studied by Brown University researchers. _Anyone tracking how foundational science findings evolve can follow research updates like this on daily.dev._ ## Similar posts on daily.dev - [Real-life experiment shows Niels Bohr was right in a theoretical debate with Einstein](https://daily.dev/posts/real-life-experiment-shows-niels-bohr-was-right-in-a-theoretical-debate-with-einstein-3dxkhh9cb) · Phys.org · 0 upvotes · 0 comments - [Scientists Observe Einstein’s Gravity in The Quantum World](https://daily.dev/posts/scientists-observe-einstein-s-gravity-in-the-quantum-world-hendyfoif) · The Quantum Insider · 0 upvotes · 0 comments - [Physicists bridge worlds of quantum matter](https://daily.dev/posts/physicists-bridge-worlds-of-quantum-matter-qsuwndcyx) · Phys.org · 0 upvotes · 0 comments - [New study bridges the worlds of classical and quantum physics](https://daily.dev/posts/new-study-bridges-the-worlds-of-classical-and-quantum-physics-w8pglqc5y) · MIT News · 0 upvotes · 0 comments - [TU Wien Researchers Find Entanglement in ‘Strange’ Metal](https://daily.dev/posts/tu-wien-researchers-find-entanglement-in-strange-metal-coyrykncr) · The Quantum Insider · 0 upvotes · 0 comments --- Tags: [#physics](https://daily.dev/tags/physics) [View this post on daily.dev](https://daily.dev/posts/even-chemical-bonds-obey-einstein-s-relativity-ap9wx4yag) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Even Chemical Bonds Obey Einstein’s Relativity","url":"https://daily.dev/posts/even-chemical-bonds-obey-einstein-s-relativity-ap9wx4yag","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/even-chemical-bonds-obey-einstein-s-relativity-ap9wx4yag"},"datePublished":"2026-07-16T17:32:31.136Z","dateModified":"2026-09-14T06:25:50.246Z","description":"Brown University scientists have measured relativistic effects in chemical bonds at the atomic scale, specifically in bismuth-carbon triple bonds. 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Brown University researchers demonstrated this using photoelectron spectroscopy to measure bond strength in a bismuth-carbon triple bond, finding the effect makes the bond stronger than the conventional sigma-pi model would predict, since pi bonds are normally weaker than sigma bonds. Curious readers exploring how physics reshapes chemistry basics can follow research breakdowns like this on daily.dev."}},{"@type":"Question","name":"Does the standard sigma-pi model of triple bonds still apply to lighter elements?","acceptedAnswer":{"@type":"Answer","text":"Yes, the conventional model of triple bonds having a distinct sigma bond and two pi bonds still holds for lighter atomic nuclei. The breakdown into a hybrid bond only becomes significant when enough atomic mass is present to produce measurable relativistic effects, as demonstrated with the heavy bismuth-209 nucleus in a bismuth-carbon triple bond studied by Brown University researchers. Anyone tracking how foundational science findings evolve can follow research updates like this on daily.dev."}}]} ```