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ARTICLES FRONT MATTER AUTHORS TOPICS SIGN IN SUBMIT 102 No Nobelium 259 404 Page Not Found The requested page is unavailable due to a broken or nonexistent link. Please use the search bar to find what you are looking for. Quick Search anywhere SEARCH SEARCH 91 Pa Protactinium 231.04 32 Ge Germanium 72.630 9 F Fluorine 18.998 8 O Oxygen 15.999 92 U Uranium 238.03 60 Nd Neodymium 144.24 Sign up for the PNAS Highlights newsletter Get in-depth science stories sent to your inbox twice a month. SUBSCRIBE BROWSE CURRENT ISSUE PNAS NEXUS SPECIAL FEATURES LIST OF ISSUES COLLECTED PAPERS PNAS IN THE NEWS FRONT MATTER JOURNAL CLUB MULTIMEDIA PODCASTS INFORMATION ABOUT SUSTAINABLE DEVELOPMENT GOALS EDITORIAL BOARD AUTHORS REVIEWERS SUBSCRIBERS LIBRARIANS PRESS COZZARELLI PRIZE PNAS UPDATES Copyright © 2025 National Academy of Sciences. All rights reserved. | Online ISSN 1091-6490 PNAS is a partner of CHORUS, CLOCKSS, COPE, CrossRef, ORCID, and Research4Life. Contact Site Map Terms & Privacy Policy Accessibility