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A radioactive element of the alkali-metal group discovered as a disintegration product of actinium
Answer for the clue "A radioactive element of the alkali-metal group discovered as a disintegration product of actinium ", 8 letters:
francium
Word definitions for francium in dictionaries
Wiktionary
Word definitions in Wiktionary
n. A metallic chemical element (''symbol'' Fr) with an atomic number of 87.
Douglas Harper's Etymology Dictionary
Word definitions in Douglas Harper's Etymology Dictionary
radioactive element, 1946, named by French physicist Marguerite Catherine Perey (1909-1975) who first identified it at the Curie Institute in Paris, from Latinized form of France + element ending -ium .
WordNet
Word definitions in WordNet
n. a radioactive element of the alkali-metal group discovered as a disintegration product of actinium [syn: Fr , atomic number 87 ]
Wikipedia
Word definitions in Wikipedia
Francium is a chemical element with symbol Fr and atomic number 87. It used to be known as eka - caesium and actinium K. It is the second-least electronegative element, behind only caesium . Francium is a highly radioactive metal that decays into astatine ...
Usage examples of francium.
The intermediate elements referred to in this radioactive decay chain are lead (symbol Pb, element 82), polonium (Po, element 84), astatine (At, element 85), francium (Fr, element 87), radium (Ra, element 88), actinium (Ac, element 89), thorium (Th, element 90), protoactinium (Pa, element 91), uranium (U, element 92), neptunium (Np, element 93), and americium (Am, element 95).