large/12904/worldswithinworlds_v1-3_1904_librivox_64kb_mp3/worldswithinworlds_01_asimov_64kb_230
large/12904/worldswithinworlds_v1-3_1904_librivox_64kb_mp3/worldswithinworlds_01_asimov_64kb
English
12904
Thomson showed, from the amount of curving, that there was a neon isotope with an atomic weight of 20 and one with an atomic weight of 22—²⁰Ne and ²²Ne. THOMPSON SHOWED FROM THE AMOUNT OF CURVING THAT THERE WAS A NEON ISOTOPE WITH AN ATOMIC WEIGHT OF TWENTY AND ONE WITH AN ATOMIC WEIGHT OF TWENTY TWO NEON TWENTY AND NEON TW
othing to do with any of the radioactive series. If neon had isotopes then any element might have them. In 1912 Thomson was working on neon. He sent a stream of cathode-ray electrons through neon gas. The electrons smashed into the neon atoms and knocked an electron off some of them. That left a neon ion carrying a single positive charge—an ion that could be written Ne⁺. The neon ions move in the electric field as electrons do, but in the opposite direction since they have an opposite charge. In the combined presence of a magnet and of an electric field, the neon ions move in a curved path. If all the neon ions had the same mass, all would follow the same curve. If some were more massive than others, the more massive ones would curve less. The neon ions ended on a photographic plate, which was darkened at the point of landing. There were two regions of darkening, because there were neon ions of two different masses that curved in two different degrees and ended in two different places. TO DO WITH ANY OF THE RADIOACTIVE SERIES IF NEEON HAD ISOTOPES THEN ANY ELEMENT MIGHT HAVE THEM IN NINETEEN TWELVE THOMPSON WAS WORKING ON NEEON HE SENT A STREAM OF CATHODE RE ELECTRONS THROUGH NEEON GAS THE ELECTRONS SMASHED INTO THE NEEON ATOMS AND KNOCKED AN ELECTRON OFF SOME OF THEM THAT LEFT A NEON ION CARRYING A SINGLE POSITIVE CHARGE AN ION THAT COULD BE WRITTEN IN E PLUS THE NEEON IONS MOVE IN THE ELECTRIC FIELD AS ELECTRONS DO BUT IN THE OPPOSITE DIRECTION SINCE THEY HAVE AN OPPOSITE CHARGE IN THE COMBINED PRESENCE OF A MAGNET AND OF AN ELECTRIC FIELD THE NEEON IONS MOVE IN A CURVED PATH IF ALL THE NEEAN IONS HAD THE SAME MASS ALL WOULD FOLLOW THE SAME CURVE IF SOME WERE MORE MASSIVE THAN OTHERS THE MORE MASSIVE ONES WOULD CURVE LESS THE NEEON IONS ENDED ON A PHOTOGRAPHIC PLATE WHICH WAS DARKENED AT THE POINT OF LANDING THERE WERE TWO REGIONS OF DARKENING BECAUSE THERE WERE NEON IONS OF TWO DIFFERENT MASSES THAT CURVED IN TWO DIFFERENT DEGREES AND ENDED IN TWO DIFFERENT PLACES
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