Science and Life: Aberdeen AdressesE. P. Dutton, 1920 - 229 páginas |
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Página 91
... separated from it by prolonged and tedious fractionation processes . Chemically it was normal in every respect , and its chemical character could have been predicted from the Periodic Law before its discovery . But in addition to its ...
... separated from it by prolonged and tedious fractionation processes . Chemically it was normal in every respect , and its chemical character could have been predicted from the Periodic Law before its discovery . But in addition to its ...
Página 93
... separation is needed , as they diffuse away by themselves from the radioactive substance into the surrounding air and are the cause of many striking phenomena . The doctrine of the unchangeableness of the chemical elements is no fixed ...
... separation is needed , as they diffuse away by themselves from the radioactive substance into the surrounding air and are the cause of many striking phenomena . The doctrine of the unchangeableness of the chemical elements is no fixed ...
Página 94
... separated as often as desired . Once separated , the radioactivity of the products dies away or decays , and the apparently steady continuous emission of rays from the parent substance is due to an equilibrium , in which new radioactive ...
... separated as often as desired . Once separated , the radioactivity of the products dies away or decays , and the apparently steady continuous emission of rays from the parent substance is due to an equilibrium , in which new radioactive ...
Página 95
... separated uranium from radium and everything else completely and left it to itself , in the course of years or centuries a new crop of radium would be gradually formed . The case of radium is specially interesting as it has been ...
... separated uranium from radium and everything else completely and left it to itself , in the course of years or centuries a new crop of radium would be gradually formed . The case of radium is specially interesting as it has been ...
Página 112
... By simple purification , by chemical and physical means , constituents respon- sible for the greater part of .the radioactivity of THORIUM PRODUCTS 113 thorium can be separated , and as 112 CONCEPTION OF THE CHEMICAL ELEMENT.
... By simple purification , by chemical and physical means , constituents respon- sible for the greater part of .the radioactivity of THORIUM PRODUCTS 113 thorium can be separated , and as 112 CONCEPTION OF THE CHEMICAL ELEMENT.
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a-particle Aberdeen actinium active æsthetic ancient animal Arts 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 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 inanimate universe investigation ionium isotopes J. J. Thomson knowledge known labour lead living mass material means mechanism ment million mind minerals modern nation nature original past Periodic Law periodic table philosophy physical pitchblende polonium practical present problem processes pure quantity radio-elements radioactive change radium radium-C recognised regard scientific study Scotland Soddy spectroscopic spectrum spirit study and research subjects teaching technical or commercial thallium thought tion to-day transmutation truth ultimate University of Aberdeen uranium and thorium uranium-X wealth whole