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සංකේතය (රසායනික මූලද්රව්යය)
early years of radiochemistry, and several isotopes (namely those in the actinium decay family, the radium decay family, and the thorium decay family) bear
(element) Thallium Lead Bismuth Polonium Astatine Radon Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium
Alkali metal 88 Radium Ra 2 7 s Solid From decay Alkaline earth metal 89 Actinium Ac 3 7 f Solid From decay Actinide 90 Thorium Th 3 7 f Solid Primordial
(element) Thallium Lead Bismuth Polonium Astatine Radon Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium
(element) Thallium Lead Bismuth Polonium Astatine Radon Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium