Radioactive element discovered in 1907
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IONIUMRadioactive element discovered in 1907.
mendeleviuman unstable radioactive element discovered in 1955
mendeleviumsMENDELEVIUM, an unstable radioactive element discovered in 1955
poradioactive element discovered by Pierre and Marie Curie in 1898; Symbol: Po; at. no.: 84; at. wt.: about 210
poloniumradioactive element discovered by Pierre and Marie Curie in 1898; Symbol: Po; at. no.: 84; at. wt.: about 210
curiumsradioactive element not found in nature but discovered in 1944 among the products of plutonium after bombardment by high-energy helium ions. Symbol: Cm; at. no.: 96
curiumradioactive element not found in nature but discovered in 1944 among the products of plutonium after bombardment by high-energy helium ions. Symbol: Cm; at. no.: 96
einsteiniumThe chemical element of atomic number 99, a radioactive metal of the actinide series. Einsteinium does not occur naturally and was discovered in 1953 in debris from the first hydrogen bomb explosion
neptuniumThe chemical element of atomic number 93, a radioactive metal of the actinide series. Neptunium was discovered as a product of the bombardment of uranium with neutrons, and occurs only in trace amounts in nature