Radioactive element no 90
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THORIUMRadioactive element no. 90.
ioniumsnaturally occurring radioactive isotope of thorium. Symbol: Io; at. no.: 90; at. wt.: 230
ioniumnaturally occurring radioactive isotope of thorium. Symbol: Io; at. no.: 90; at. wt.: 230
URANIUMRadioactive element No. 92.
ACARadioactive element No. 84: Abbr.
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
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
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
actiniumradioactive silver-white metallic element that glows blue in the dark, resembling the rare earths in chemical behavior and valence. Symbol: Ac; at. no.: 89; at. wt.: 227