1) Atomic number 87 2) Chemical element 3) Element discovered in 1939 4) Element number 87 5) Element with the symbol Fr 6) Metal 7) Metallic element
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1) Fr
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https://www.crosswordclues.com/clue/francium
Francium is a chemical element with symbol Fr and atomic number 87. It was formerly known as eka-caesium and actinium K. It is one of the two least electronegative elements, the other being caesium. Francium is a highly radioactive metal that decays into astatine, radium, and radon. As an alkali metal, it has one valence electron. Bulk francium ha...
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http://en.wikipedia.org/wiki/Francium
heaviest chemical element of Group 1 (also called Group Ia) in the periodic table, the alkali metal group. It exists only in short-lived radioactive ... [2 related articles]
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http://www.britannica.com/eb/a-z/f/55
<chemical> Francium. A radioactive alkali metal with the atomic symbol fr, atomic number 87, and atomic weight 223. The mass numbers of other known isotopes are 204-213, 217-222, and 224. Its valence is +1. ... Chemical name: Francium ... (12 Dec 1998) ...
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(Fr) (fran´se-әm) a chemical element, atomic number 87, atomic weight 223.
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http://www.encyclo.co.uk/local/21001
(Fr) Type: Term Pronunciation: fran′sē-ŭm Definitions: 1. Radioactive element of the alkali metal series; atomic no. 87; half-life of most stable known isotope, 223Fr, is 21.8 min.
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[
n] - a radioactive element of the alkali-metal group discovered as a disintegration product of actinium
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The heaviest alkali metal with no stable isotopes. Symbol Fr
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https://www.encyclo.co.uk/local/20687
Radioactive metallic element, atomic number 87, relative atomic mass 223. It is one of the alkali metals and occurs in nature in small amounts as a decay product of actinium. Its longest-lived isotope has a half-life of only 21 minutes. Francium was discovered and named in 1939 by Marguérite Perey, to honour her country
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a radioactive element of the alkali metal group. Symbol: Fr; at. no.: 87.
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https://www.infoplease.com/dictionary/francium
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