The Transactinides the TRANSACTINIDES ARE ALL SYNTHETIC, RADIOACTIVE ELEMENTS, WHICH ARE UNSTABLE and GENERALLY ONLY EXIST for FRACTIONS of a SECOND

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The Transactinides THE TRANSACTINIDES ARE ALL SYNTHETIC, RADIOACTIVE ELEMENTS, WHICH ARE UNSTABLE AND GENERALLY ONLY EXIST FOR FRACTIONS OF A SECOND 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 Rf Db Sg Bh Hs Mt Ds Rg Cn Uut Fl Uup Lv Uus Uuo Rutherforfium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Ununtrium Flerovium Ununpentium Livermorium Ununseptium Ununoctium DATES OF DISCOVERY OF THE TRANSACTINIDES 1960 Rf Db Sg Bh Mt Hs Ds Rg Cn Fl Lv 2014 1968 1970 1974 1981 1982 1984 1994 1996 1999 2000 THE TRANSACTINIDES ARE ALL ELEMENTS 113, 115, 117 & 118 RUTHERFORDIUM RADIOACTIVE HAVE YET TO HAVE THEIR ERNEST RUTHERFORD WON A NOBEL PRIZE FOR WORK ON RADIOACTIVITY DISCOVERIES CONFIRMED & DEVELOPED THE ORBITAL THEORY OF THE ATOM COUNTRY OF DISCOVERY 113 SEABORGIUM NAMES SUCH AS Uut GLENN SEABORG 115 WON A NOBEL PRIZE FOR HIS WORK ON THE SYNTHESIS UNUNOCTIUM Uup & CHEMISTRY OF TEN OF THE TRANSURANIUM ELEMENTS 5 4 6 ARE PLACEHOLDER NAMES 117 Uus BOHRIUM UNTIL AN OFFICIAL 118 NIELS BOHR Uuo INCLUDES US/RUSSIA JOINT DISCOVERIES WON A NOBEL PRIZE FOR DEVELOPING THE BOHR MODEL NAME IS CHOSEN OF THE ATOM, WITH ELECTRONS ORBITING THE NUCLEUS MEITNERIUM 28 HOURS Cf Cs LISE MEITNER WORKED ON RADIOACTIVITY & NUCLEAR PHYSICS, AND WAS HALF LIFE OF THE MOST PART OF THE TEAM THAT DISCOVERED NUCLEAR FISSION STABLE TRANSACTINIDE THE TRANSACTINIDES ARE ROENTGENIUM ISOTOPE, DUBNIUM-268 FORMED BY COLLIDING ATOMS WILHEM RÖNTGEN WON THE FIRST NOBEL PRIZE IN PHYSICS IN 1901 OF DIFFERENT ELEMENTS FOR HIS DISCOVERY OF X-RAYS (RÖNTGEN RAYS) MOST TRANSACTINIDES COPERNICIUM EXIST FOR ONLY ELEMENTS ABOVE UNUNOCTIUM ARE PROPOSED TO EXIST BUT AS NICOLAUS COPERNICUS FRACTIONS OF A SECOND MATHEMATICIAN & ASTRONOMER WHO FORMULATED YET HAVE NOT BEEN DISCOVERED SCIENTISTS NAMED AFTER FAMOUS TRANSACTINIDES A HELIOCENTRIC MODEL OF THE UNIVERSE 2014 COMPOUND INTEREST - WWW.COMPOUNDCHEM.COM.

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Evolution and Understanding of the D-Block Elements in the Periodic Table Cite This: Dalton Trans., 2019, 48, 9408 Edwin C
Dalton Transactions View Article Online PERSPECTIVE View Journal | View Issue Evolution and understanding of the d-block elements in the periodic table Cite this: Dalton Trans., 2019, 48, 9408 Edwin C. Constable Received 20th February 2019, The d-block elements have played an essential role in the development of our present understanding of Accepted 6th March 2019 chemistry and in the evolution of the periodic table. On the occasion of the sesquicentenniel of the dis- DOI: 10.1039/c9dt00765b covery of the periodic table by Mendeleev, it is appropriate to look at how these metals have influenced rsc.li/dalton our understanding of periodicity and the relationships between elements. Introduction and periodic tables concerning objects as diverse as fruit, veg- etables, beer, cartoon characters, and superheroes abound in In the year 2019 we celebrate the sesquicentennial of the publi- our connected world.7 Creative Commons Attribution-NonCommercial 3.0 Unported Licence. cation of the first modern form of the periodic table by In the commonly encountered medium or long forms of Mendeleev (alternatively transliterated as Mendelejew, the periodic table, the central portion is occupied by the Mendelejeff, Mendeléeff, and Mendeléyev from the Cyrillic d-block elements, commonly known as the transition elements ).1 The periodic table lies at the core of our under- or transition metals. These elements have played a critical rôle standing of the properties of, and the relationships between, in our understanding of modern chemistry and have proved to the 118 elements currently known (Fig. 1).2 A chemist can look be the touchstones for many theories of valence and bonding.
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