Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun An extremely unstable radioactive element of the alkali metals, produced by alpha decay of actinium or artificially from thorium, having over 40 isotopes and isomers, the most stable of which is Fr-223 with a half-life of 22 minutes. Atomic number 87; melting point 27°C; boiling point 677°C; valence 1. cross-reference: Periodic Table.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun A metallic chemical element (symbol
Fr ) with anatomic number of 87.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a radioactive element of the alkali-metal group discovered as a disintegration product of actinium
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
from Wiktionary, Creative Commons Attribution/Share-Alike License
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Examples
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Some of the elements, such as francium and californium, were named to honor the places where they were discovered.
Elements 2009
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Per Wikipedia: Mercury is a heavy, silvery d-block metal [that] is one of six elements that are liquid at or near room temperature and pressure, the others being caesium, francium, gallium, bromine, and rubidium.
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Only 20 atoms of francium exist at any given instant.
Archive 2007-06-01 N A 2007
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There are some very unstable radioactive elements, like francium, that last just a couple of minutes and then decay.
The Guardian World News Jon Ronson 2012
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And phosphorus and francium and fluorine and terbium,
Qulog 2.0 2010
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Lindsay's about as unstable right now as the element francium.
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7: Nice touch of science, but it'd have to be a pretty high room temperature for cesium, francium, gallium and rubidium to melt--the lowest melting point among them is francium's 300 degrees Kelvin, which is 80.6 degrees Fahrenheit.
Archive 2007-04-01 Douglas Wolk 2007
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7: Nice touch of science, but it'd have to be a pretty high room temperature for cesium, francium, gallium and rubidium to melt--the lowest melting point among them is francium's 300 degrees Kelvin, which is 80.6 degrees Fahrenheit.
Week 49: Of Course You Realize Douglas Wolk 2007
kewpid commented on the word francium
add this to water for much fun.
September 25, 2007
oroboros commented on the word francium
Fr.
December 16, 2007