Science and Life: Aberdeen AddressesJ. Murray, 1920 - 229 páginas |
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Página 19
... spectrum . For radium , though the proportion in which it exists in the richest uranium mineral is exceedingly minute , it is just possible to obtain enough to weigh and to prepare in a pure condition for chemical examination . The most ...
... spectrum . For radium , though the proportion in which it exists in the richest uranium mineral is exceedingly minute , it is just possible to obtain enough to weigh and to prepare in a pure condition for chemical examination . The most ...
Página 91
... spectrum , and atomic weight . They found its atomic weight to be 226 , which is next to that of uranium , 238 , and thorium , 232. This and its chemical character put it into a position in the periodic table in the family of the ...
... spectrum , and atomic weight . They found its atomic weight to be 226 , which is next to that of uranium , 238 , and thorium , 232. This and its chemical character put it into a position in the periodic table in the family of the ...
Página 95
... spectrum , atomic weight , chemical properties and position in the Periodic Table . It was one of very many startling predictions of a similar character made as soon as the new point of view was attained . But it has been the last to ...
... spectrum , atomic weight , chemical properties and position in the Periodic Table . It was one of very many startling predictions of a similar character made as soon as the new point of view was attained . But it has been the last to ...
Página 99
... spectrum . This was in 1903 , at the time when pure radium compounds were being put on the market for the first time by the enterprise of the German technical chemist , Dr Giesel . The first thing done with it in the late Sir William ...
... spectrum . This was in 1903 , at the time when pure radium compounds were being put on the market for the first time by the enterprise of the German technical chemist , Dr Giesel . The first thing done with it in the late Sir William ...
Página 102
... weight is less than it was by 4 units , but in its whole chemical nature and even in its spectrum , it is not merely like its original ISOTOPES 103 Elements parent . It is chemically identical with 102 THE EVOLUTION OF MATTER.
... weight is less than it was by 4 units , but in its whole chemical nature and even in its spectrum , it is not merely like its original ISOTOPES 103 Elements parent . It is chemically identical with 102 THE EVOLUTION OF MATTER.
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a-particle actinium active ancient animal atomic number atomic weight B-ray bismuth branch British Science Guild Carnegie Trust cent century chemical character chemical elements chemist chemistry classical coal commercial education complete conception creative definite direct discovery disintegration electricity electrons emanation energy evolved existence expelled experimental external Faculty FREDERICK SODDY fundamental H. H. Asquith helium hitherto human ideals important inanimate universe investigation ionium isotopes J. J. Thomson knowledge known labour lead living material means mechanism ment million mind minerals modern nation nature original past Periodic Law periodic table philosophy physical pitchblende polonium practical present problem processes Professor progress pure quantity radio-elements radioactive change radium recognised regard religion scientific study Scotland Soddy spectroscopic spectrum spirit study and research subjects successive teaching technical or commercial thallium thought tion to-day transmutation truth ultimate University of Aberdeen uranium and thorium wealth whole