francium
n. (Fr) radioactive chemical element | ||||
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Francium Definition from Language, Idioms & Slang Dictionaries & Glossaries
| WordNet 2.0 |
francium
Noun
1. a radioactive element of the alkali-metal group discovered as a disintegration product of actinium
(synonym) Fr, atomic number 87
(hypernym) metallic element, metal
Noun
1. a radioactive element of the alkali-metal group discovered as a disintegration product of actinium
(synonym) Fr, atomic number 87
(hypernym) metallic element, metal
Francium Definition from Science & Technology Dictionaries & Glossaries
| Mineralogy Database |
Francium (Fr)
Atomic Mass : 223
Atomic Number : 87
Name Origins: Named after France
Year Discovered : 1939
Discovery Credits : Discovered by Marguerite Perey in Paris, France.
More Details
Atomic Mass : 223
Atomic Number : 87
Name Origins: Named after France
Year Discovered : 1939
Discovery Credits : Discovered by Marguerite Perey in Paris, France.
More Details
| Chemistry of the Elements |
Francium
Name: francium
Symbol: Fr
Atomic number: 87
Atomic weight: [ 223 ]
Group in periodic table: 1
Group name: Alkaline metal
Period in periodic table: 7
Block in periodic table: s-block
CAS registry ID: 7440-73-5
Francium occurs as a result of a disintegration of actinium. Francium is found in uranium minerals, and can be made artificially by bombarding thorium with protons. It is the most unstable of the first 101 elements. The longest lived isotope, 223Fr, a daughter of 227Ac, has a half-life of 22 minutes. This is the only isotope of francium occurring in nature, but at most there is only 20-30 g of the element present in the earth's crust at any one time. No weighable quantity of the element has been prepared or isolated. There are about 20 known isotopes.
Name: francium
Symbol: Fr
Atomic number: 87
Atomic weight: [ 223 ]
Group in periodic table: 1
Group name: Alkaline metal
Period in periodic table: 7
Block in periodic table: s-block
CAS registry ID: 7440-73-5
Francium occurs as a result of a disintegration of actinium. Francium is found in uranium minerals, and can be made artificially by bombarding thorium with protons. It is the most unstable of the first 101 elements. The longest lived isotope, 223Fr, a daughter of 227Ac, has a half-life of 22 minutes. This is the only isotope of francium occurring in nature, but at most there is only 20-30 g of the element present in the earth's crust at any one time. No weighable quantity of the element has been prepared or isolated. There are about 20 known isotopes.
Francium Definition from Entertainment & Music Dictionaries & Glossaries
| English to Federation-Standard Golic Vulcan |
Francium
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Francium Definition from Encyclopedia Dictionaries & Glossaries
| Wikipedia English - The Free Encyclopedia |
Francium
Francium (IPA: ), formerly known as eka-caesium and actinium K, is a chemical element that has the symbol Fr and atomic number 87. It has the lowest known electronegativity and is the second rarest naturally occurring element (after Astatine). Francium is a highly radioactive metal that decays into astatine, radium, and radon. As an alkali metal, it has one valence electron.
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