francium
francium
Symbol: Fr
Atomic number: 87
Atomic weight: (223)
Radioactive element, belongs to group 1 of the periodic table. Found in uranium and thorium ores. The 22 known isotopes are all radioactive, with the most stable being Fr-223. Its existence was confirmed in 1939 by Marguerite Perey.

Elements of periodic system. 2013.

  • Francium — Radon ← Francium → Radium Cs …   Wikipédia en Français

  • FRANCIUM — De France Symbole chimique: Fr Numéro atomique: 87. Dernier représentant des métaux alcalins dont la case dans le tableau périodique resta vacante jusqu’à 1939, quand Marguerite Perrey (Institut Curie à Paris) en découvrit un isotope radioactif… …   Encyclopédie Universelle

  • francium — FRÁNCIUM s.n. v. franciu. Trimis de LauraGellner, 13.09.2007. Sursa: DN …   Dicționar Român

  • francium — [fran′sē əm] n. [ModL < FRANCE2 + IUM] a radioactive chemical element, an alkali metal, existing in minute amounts in nature as a decay product of actinium: symbol, Fr; at. no., 87: see the periodic table of elements in the Reference… …   English World dictionary

  • Francium — radon ← francium → radium Cs ↑ Fr ↓ Uue …   Wikipedia

  • Francium — Eigenschaften …   Deutsch Wikipedia

  • francium — /fran see euhm/, n. Chem. a radioactive element of the alkali metal group. Symbol: Fr; at. no.: 87. [1945 50; after FRANCE where first identified; see IUM] * * * ▪ chemical element  heaviest chemical element of Group 1 (Ia) in the periodic table …   Universalium

  • Francium — Frạn|ci|um 〈n.; s; unz.; chem. 〉 radioaktives Alkalimetall, Ordnungszahl 87; oV Franzium [<nlat. Francia „Frankreich“ + lat. Endung ...ium] * * * Frạn|ci|um [frz. France =Frankreich; ↑ ium (1)], das; s; Symbol: Fr: äußerst seltenes,… …   Universal-Lexikon

  • Francium — francis statusas T sritis fizika atitikmenys: angl. francium; virginium vok. Francium, n rus. франций, m pranc. francium, m …   Fizikos terminų žodynas

  • francium — francis statusas T sritis fizika atitikmenys: angl. francium; virginium vok. Francium, n rus. франций, m pranc. francium, m …   Fizikos terminų žodynas