Synonymer & Information om | Engelska ordet FRANCIUM

Exempel på hur man kan använda FRANCIUM i en mening

• The alkali metals consist of the chemical elements lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs), and francium (Fr).
• For example, ununennium is expected to be less reactive than caesium and francium and closer in behavior to potassium or rubidium, and while it should show the characteristic +1 oxidation state of the alkali metals, it is also predicted to show the +3 and +5 oxidation states, which are unknown in any other alkali metal.
• The seventh period contains 32 elements, tied for the most with period 6, beginning with francium and ending with oganesson, the heaviest element currently discovered.
• In 1939, Perey discovered the element francium by purifying samples of lanthanum that contained actinium.
• All elements with atomic number of 106 (seaborgium) or greater have most-stable-known isotopes shorter than that of francium, but as those elements have only a relatively small number of isotopes discovered, the possibility remains that undiscovered isotopes of these elements may have longer half-lives.
• This low solubility played an important role in the characterization of francium as an alkali metal, as francium perchlorate coprecipitates with caesium perchlorate.
• This represents isotopes of the first 105 elements, except for elements 87 (francium), 102 (nobelium) and 104 (rutherfordium).
• Among other notable scientists who have served on the Commission were Georges Urbain (discoverer of lutetium, though priority was disputed with Carl Auer von Welsbach), André-Louis Debierne (discoverer of actinium, though priority has been disputed with Friedrich Oskar Giesel), Marguerite Perey (discoverer of francium), Georgy Flyorov (namesake of the element flerovium), Robert Whytlaw-Gray (first isolated radon), and Arne Ölander (Secretary and Member of the Nobel Committee for Chemistry).
• This coprecipitation can be used to isolate francium, by adapting the radiocaesium coprecipitation method of Lawrence E.

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