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astát
Heslo astát Heslo anglicky Astatine Vysvetľujúca pozn. v angl. Astatine. A radioactive halogen with the atomic symbol At, and atomic number 85. Its isotopes range in mass number from 200 to 219 and all have an extremely short half-life. Astatine may be of use in the treatment of hyperthyroidism because it emits ALPHA PARTICLES. 
predmetové heslo
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