Abstract
THE radio-element actinium K recently discovered1 derives from actinium (Z = 89) by emission of an α-particle and is placed in the position 87 of the Mendeléeff table. This element behaves chemically like an alkaline metal, and its period is 21 minutes.
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Perey, M., C.R., 208, 97 (1939).
Lecoin, M., J. Phys. et le Radium, 9, 81 (1938).
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PEREY, M., LECOIN, M. β Spectrum of Actinium K. Nature 144, 326 (1939). https://doi.org/10.1038/144326a0
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DOI: https://doi.org/10.1038/144326a0
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