large/12904/worldswithinworlds_v1-3_1904_librivox_64kb_mp3/worldswithinworlds_01_asimov_64kb_57
large/12904/worldswithinworlds_v1-3_1904_librivox_64kb_mp3/worldswithinworlds_01_asimov_64kb
English
12904
The uranium series, the thorium series, and the actinium series all ended in lead. In each case the lead formed was stable (not radioactive). THE URANIUM SERIES THE THORIUM SERIES AND THE ACTINIUM SERIES ALL ENDED IN LEAD IN EACH CASE THE LEAD FORMED WAS STABLE NOT RADIOACTIVE
fferent kinds of atoms in the uranium radioactive series. He also studied “thorium B” in the thorium radioactive series and “actinium B” in the actinium radioactive series. All four are chemically the same as ordinary lead; all four are in the same place in the list of elements. Yet each is different from the radioactive standpoint. Though all give off beta particles, radium B has a half-life of 27 minutes, radium D one of 19 years, thorium B one of 11 hours, and actinium B one of 36 minutes. In 1913 Soddy called atoms that were in the same place in the list of elements, but which had different radioactive properties, “isotopes”, from Greek words meaning “same place”. At first, it seemed that the only difference between isotopes might be in their radioactive properties and that only radioactive atoms were involved. Quickly that proved not to be so. It proved that it was possible to have several forms of the same element that were all different even though none of them were radioactive. OMS IN THE URANIUM RADIOACTIVE SERIES HE ALSO STUDIED THORIUM B IN THEIR THORIUM RADIOACTIVE SERIES AND ACTINIUM B IN THE ACTINIUM RADIOACTIVE SERIES ALL FOUR ARE CHEMICALLY THE SAME AS ORDINARY LEAD ALL FOUR ARE IN THE SAME PLACE IN THE LIST OF ELEMENTS YET EACH IS DIFFERENT FROM THE RADIOACTIVE STANDPOINT THOUGH ALL GIVE OFF BATEER PARTICLES RADIUM B HAS A HALF LIFE OF TWENTY SEVEN MINUTES RADIUM D ONE OF NINETEEN YEARS THORIUM B ONE OF ELEVEN HOURS AND ACTINIUM B ONE OF THIRTY SIX MINUTES IN NINETEEN THIRTEEN SODDY CALLED ATOMS THAT WERE IN THE SAME PLACE IN THE LIST OF ELEMENTS BUT WHICH HAD DIFFERENT RADIOACTIVE PROPERTIES ISOTOPES FROM GREEK WORDS MEANING SAME PLACE AT FIRST IT SEEMED THAT THE ONLY DIFFERENCE BETWEEN ISOTOPES MIGHT BE IN THEIR RADIOACTIVE PROPERTIES AND THAT ONLY RADIOACTIVE ATOMS WERE INVOLVED QUICKLY THAT PROVED NOT TO BE SO IT PROVED THAT IT WAS POSSIBLE TO HAVE SEVERAL FORMS OF THE SAME ELEMENT THAT WERE ALL DIFFERENT EVEN THOUGH NONE OF THEM WERE RADIOACTIVE
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