ProgDOC - a program documentation system by Simonis V. PDF

By Simonis V.

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Hydrogen, for example, the lightest element, has the atomic number 1. It normally has one proton and no neutrons, and thus its atomic mass is also 1. But hydrogen has two isotopes with different atomic masses. Heavy hydrogen, or deuterium, has one proton and one neutron in its nucleus, and thus its atomic mass is 2. Hydrogen also has a radioactive isotope, tritium. Tritium has one proton and two neutrons, and thus its atomic mass is 3. Hydrogen and its isotopes have the same chemical properties.

Thanks to the intervention of the Academy of Sciences in Vienna, the Austrian government made a free gift to the Curies of a ton of pitchblende from which the uranium had already been removed, and agreed to make several more tons available at a good price. Of no interest to anyone until the Curies began to uncover the wondrous properties of radium, the pitchblende residues had been dumped into a pine forest near a mine at St. Joachimsthal in Bohemia. When the first shipment was delivered to the Curies’ laboratory, Marie ripped open the bags and sifted through the pine needles, like an overeager child unwrapping birthday gifts.

Marie’s failure to face up to the possible link between radioactivity and the decline in their health is all the more 47 Marie Curie Marie Curie with some of her students at the teachers’ training institute for women in Sèvres, where she was the first woman appointed to the faculty. puzzling because of her awareness of Pierre’s trailblazing studies of the effects of radium on living organisms. After two German scientists announced that radioactive substances affected living tissue, Pierre intentionally burned his arm by exposing it to radium for several hours.

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ProgDOC - a program documentation system by Simonis V.


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