Definitions for francium
ˈfræn si əmfran·ci·um

Princeton's WordNetRate this definition:0.0 / 0 votes

1. francium, Fr, atomic number 87noun

   a radioactive element of the alkali-metal group discovered as a disintegration product of actinium

WiktionaryRate this definition:1.0 / 1 vote

1. franciumnoun

   A metallic chemical element (symbol Fr) with an atomic number of 87.

2. Etymology: From francium, from (after the native country of.

WikipediaRate this definition:0.0 / 0 votes

1. Francium

   Francium is a chemical element with the symbol Fr and atomic number 87. It is extremely radioactive; its most stable isotope, francium-223 (originally called actinium K after the natural decay chain in which it appears), has a half-life of only 22 minutes. It is the second-most electropositive element, behind only caesium, and is the second rarest naturally occurring element (after astatine). The isotopes of francium decay quickly into astatine, radium, and radon. The electronic structure of a francium atom is [Rn] 7s1, and so the element is classed as an alkali metal. Bulk francium has never been seen. Because of the general appearance of the other elements in its periodic table column, it is presumed that francium would appear as a highly reactive metal, if enough could be collected together to be viewed as a bulk solid or liquid. Obtaining such a sample is highly improbable, since the extreme heat of decay resulting from its short half-life would immediately vaporize any viewable quantity of the element. Francium was discovered by Marguerite Perey in France (from which the element takes its name) in 1939. Prior to its discovery, it was referred to as eka-caesium or ekacaesium because of its conjectured existence below caesium in the periodic table. It was the last element first discovered in nature, rather than by synthesis. Outside the laboratory, francium is extremely rare, with trace amounts found in uranium ores, where the isotope francium-223 (in the family of uranium-235) continually forms and decays. As little as 200–500 g exists at any given time throughout the Earth's crust; aside from francium-223 and francium-221, its other isotopes are entirely synthetic. The largest amount produced in the laboratory was a cluster of more than 300,000 atoms.

ChatGPTRate this definition:0.0 / 0 votes

1. francium

   Francium is a highly radioactive chemical element with the symbol Fr and atomic number 87. It is one of the alkali metals and is the second rarest naturally occurring element. Francium was discovered in 1939 and named after France, where it was first discovered. It is highly unstable and decays into astatine, radium, and radon. Due to its instability and rarity, francium has no significant commercial applications.

WikidataRate this definition:0.0 / 0 votes

1. 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 has never been viewed. Because of the general appearance of the other elements in its periodic table column, it is assumed that francium would appear as a highly reflective metal, if enough could be collected together to be viewed as a bulk solid or liquid. However preparing such a sample is impossible, since the extreme heat of decay would immediately vaporize any viewable quantity of the element. Francium was discovered by Marguerite Perey in France in 1939. It was the last element discovered in nature, rather than by synthesis. Outside the laboratory, francium is extremely rare, with trace amounts found in uranium and thorium ores, where the isotope francium-223 continually forms and decays. As little as 20–30 g exists at any given time throughout the Earth's crust; the other isotopes are entirely synthetic. The largest amount produced in the laboratory was a cluster of more than 300,000 atoms.

U.S. National Library of MedicineRate this definition:0.0 / 0 votes

1. Francium

   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.

Matched Categories

1. • Metallic Element

How to pronounce francium?

1. Alex

   US English

   David

   US English

   Mark

   US English

   Daniel

   British

   Libby

   British

   Mia

   British

   Karen

   Australian

   Hayley

   Australian

   Natasha

   Australian

   Veena

   Indian

   Priya

   Indian

   Neerja

   Indian

   Zira

   US English

   Oliver

   British

   Wendy

   British

   Fred

   US English

   Tessa

   South African

How to say francium in sign language?

Numerology

1. Chaldean Numerology

   The numerical value of francium in Chaldean Numerology is: 3

2. Pythagorean Numerology

   The numerical value of francium in Pythagorean Numerology is: 4

Popularity rank by frequency of use

References

1. ^ Princeton's WordNet
   http://wordnetweb.princeton.edu/perl/webwn?s=francium
2. ^ Wiktionary
   https://en.wiktionary.org/wiki/Francium
3. ^ Wikipedia
   https://en.wikipedia.org/wiki/Francium
4. ^ ChatGPT
   https://chat.openai.com
5. ^ Wikidata
   https://www.wikidata.org/w/index.php?search=francium