K. Dobroserdov ndiye aiva musayendisiti wokutanga kutaura kuti awana eka-caesium, kana francium. Muna 1925, akacherechedza simba redhiyo mu muyenzaniso potassium, mumwe alkali simbi, uye vakafunga zvisirizvo kuti eka-caesium akanga kusvibisa mharidzo (the radioactivity from the sample was from the naturally occurring potassium radioisotope, potassium-40).
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