Element Francium, Fr, Alkali Metal
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Element Barium, Ba, Alkaline Earth Metal. Has the combining weight 137. 4, and occurs naturally as sulphate and carbonate. Metallic barium is of a white colour, melts at a red heat, and reacts more energetically with water than strontium or calcium. We have here, therefore, a repetition of the same state of affairs as in the group of alkali metals, viz. the action with oxygen and oxygen compounds is more energetic the higher the combining weight of the metal. Barium forms only the divalent ion Ba.
Element Radium, Ra, Alkaline Earth Metal. Isotopes may be found in nature. It becomes possible because of existence of three radioactive series in which radium isotopes.
Element Caesium, Cs, Alkali Metal. Had undoubtedly been examined before, but had been mistaken by C. Plattner for potassium salts, meanwhile it was consisting of hydrous caesium. Pisani revealed it on the analysis of pollux in 1864.
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This domain states the following, "Element Francium, Fr, Alkali Metal." Our analyzers analyzed that the web page also stated " In 1939 by Marguerite Perey at Curies Institute in Paris was purifying actinium-227." The Website also stated " By Perey for her native country. Does not have stable isotopes. 27 known radioactive isotopes have mass numbers from 202 to 229. 20 min, α-decay 44, electron capture 56 and. 218 min, β-decay 99. 9; the latter is a constituent part of natural actino-uranium. Ratio in Earths crust is 4x10." The website's header had Element Francium as the most important search term. It was followed by Fr, Alkali Metal, and History which isn't as highly ranked as Element Francium. The next words they uses is Occurrence. Neighbours was also included and might not be understood by web crawlers.OTHER WEB SITES
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