The elements that Dmitri Mendeleev predicted on the periodic table



September 1, 2023

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  • When Dmitri Mendeleev (8 February 1834 - to 2 February 1907) was working on the periodic table over 150 years ago, not all the 118 elements that we know now had been discovered. However, he was able to theorise the existence and properties of some of them - did he get them right? The Cambridge Crystallographic Data Centre (CCDC) and The British Crystallographic Association (BCA) have joined forces to find out more about these! In this video Rosie Lester, PhD student in the Centre for Medical Materials at the University of Cambridge, takes us on a journey to explore the elements Mendeleev theorised on the periodic table, discover what they are called today, and illustrate some of their properties with crystal structures. Are you ready for a journey through chemistry and time? Explore with us: - 00:18 Before Mendeelev, Mendeelev's periodic table and the elements he predicted. - 01:52 Why the predicted elements have the prefix eka-? - 01:58 Eka-aluminium aka gallium. - 02:17 Text note answering the question: Why do atoms look like rugby balls in some representations? - 02:33 Eka-manganese aka technetium. - 03:11 Eka-silicon aka germanium. - 03:44 Eka-boron aka scandium. - 04:50 In which other ways could elements re-arranged? How do you think Mendeleev would re-design his periodic table, knowing all the elements we know today? - 05:12 Explore the periodic table resources and activities on the CCDC website The structures and molecules presented in this video are from the Cambridge Structural Database (CSD). The images and gif frames for each structures were generated using functionality available in the free version of CCDC's Mercury visualization software. To explore the (real) CSD structures present in this video, go to the CCDC website, then Access Structures and insert the refcode (see below) in the Identifier(s) line and click search: - ACACGA for the structure displayed containing gallium. - BAGWAH for the structure displayed containing technetium. - DEYJID for the structure displayed containing technetium. - BAKQAG for the structure displayed containing germanium. This video is aimed at anyone wanting to learn more about chemistry and the periodic table. It is particularly relevant for students aged 12 upwards studying Chemistry or Science subjects, those revising for exams or quizzes, and anyone with an inquisitive mind! Follow the CCDC on social media: Twitter: @ccdc_cambridge Facebook: Cambridge Crystallographic Data Centre (CCDC) Instagram: @ccdc_cambridge Follow the BCA on social media: Twitter: @britcryst Facebook: @britishcrystallography YouTube: BCA Education


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