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The prediction and subsequent discovery of high\u2010pressure electrides (HPEs), compounds assuming open structures where the valence electrons are localized in interstitial voids, required a paradigm shift. Our quantum chemical calculations on the iconic insulating Na\u2010hP4 HPE show that increasing density causes a 3s\u21923pd electronic transition due to Pauli repulsion between the 1s2s and 3s states, and orthogonality of the 3pd states to the core. The large lobes of the resulting Na\u2010pd hybrid orbitals point towards the center of an 11\u2010membered penta\u2010capped trigonal prism and overlap constructively, forming multicentered bonds, which are responsible for the emergence of the interstitial charge localization in Na\u2010hP4. These multicentered bonds facilitate the increased density of this phase, which is key for its stabilization under pressure.<\/jats:p>","DOI":"10.1002\/anie.202310802","type":"journal-article","created":{"date-parts":[[2023,10,5]],"date-time":"2023-10-05T15:05:54Z","timestamp":1696518354000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":30,"title":["On the Electride Nature of Na\u2010hP4"],"prefix":"10.1002","volume":"62","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4174-1732","authenticated-orcid":false,"given":"Stefano","family":"Racioppi","sequence":"first","affiliation":[{"name":"Department of Chemistry State University of New York at Buffalo (USA)  777 Natural Science Complex 14260-3000 Buffalo, NY USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5497-4404","authenticated-orcid":false,"given":"Christian 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