Science and Life: Aberdeen AdressesE. P. Dutton, 1920 - 229 páginas |
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Página 18
... successive products has a characteristic average period of life . Its atom remains in existence for a period of time which is , on the average , definite , and which varies among the various successive members between the ex- tremes ...
... successive products has a characteristic average period of life . Its atom remains in existence for a period of time which is , on the average , definite , and which varies among the various successive members between the ex- tremes ...
Página 100
... successive changes , one particle per atom at each change . The atom of thorium expels 6 a- and 3 B - particles . The B - particles are atoms of electricity rather than of matter , and their expulsion affects the mass of the parent atom ...
... successive changes , one particle per atom at each change . The atom of thorium expels 6 a- and 3 B - particles . The B - particles are atoms of electricity rather than of matter , and their expulsion affects the mass of the parent atom ...
Página 106
... successive places without gaps , as the figure shows . To get gold from mercury , expel from the atom of mercury one B - particle , which will make thallium , then one a - particle , which will turn the thallium into gold . Or , to get ...
... successive places without gaps , as the figure shows . To get gold from mercury , expel from the atom of mercury one B - particle , which will make thallium , then one a - particle , which will turn the thallium into gold . Or , to get ...
Página 113
... successive products , called thorium - A , -B , -C , and -D , are now recognised . The false interpretation of a similar phenomenon in the case of radium , before the radium emanation had been recognised , led to the view that inactive ...
... successive products , called thorium - A , -B , -C , and -D , are now recognised . The false interpretation of a similar phenomenon in the case of radium , before the radium emanation had been recognised , led to the view that inactive ...
Página 114
... successive changes , in which new elements are pro- duced , of chemical and physical character totally distinct from those of the parent element , the only one capable of explaining the facts . Novel and unexpected as it was to find ...
... successive changes , in which new elements are pro- duced , of chemical and physical character totally distinct from those of the parent element , the only one capable of explaining the facts . Novel and unexpected as it was to find ...
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Términos y frases comunes
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