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francium

n. 钫

钫

WordNet (r) 3.0 (2006) (WordNet)

francium
n 1: a radioactive element of the alkali-metal group discovered
as a disintegration product of actinium [synonym: {francium},
{Fr}, {atomic number 87}]

The Elements Database (element)

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.

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英文字典中文字典相关资料:

Francium - Wikipedia
Francium is a chemical element; it has 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
Francium | Radioactive, Alkali Metal, Rare | Britannica
francium (Fr), heaviest chemical element of Group 1 (Ia) in the periodic table, the alkali metal group It exists only in short-lived radioactive forms Natural francium cannot be isolated in visible, weighable amounts, for only 24 5 grams (0 86 ounce) occur at any time in the entire crust of Earth
Francium Facts, Symbol, Discovery, Properties, Uses
Francium definition, discovery, properties (atomic mass, color, melting point, atomic number, electron configuration), reactivity in water, common uses
Francium - Element information, properties and uses | Periodic Table
Francium, number 87, was the last of these elements to be discovered in nature From its position in the table, it was clear that element 87 would be a reactive alkali metal, the heaviest member of the family lithium, sodium, potassium, rubidium and caesium
Francium - Francium - Modrinth
Francium Vanilla on Steroids 5 months of research in order to bring you the BEST optimization and QoL mods [Available for 1 21 9]
Francium | Fr (Element) - PubChem
Chemical element, Francium, information from authoritative sources Look up properties, history, uses, and more
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Grown in the fertile valleys of Ecuador, our organic single origin heirloom cacao is celebrated for its naturally floral aroma, nuanced complexity, and remarkable rarity Representing a small fraction of the world’s fine flavor cacao, it remains one of the most precious expressions of its origin
Francium Element Facts - chemicool. com
Francium is a heavy, unstable, radioactive metal with a maximum half-life of only 22 minutes It has a low melting point (27 o C, 81 o F) and, if enough of it could be accumulated, it would be liquid in a warm room Francium is the second rarest element in the Earth’s crust, next to astatine
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Francium is the most popular and largest Apple product seller in Sri Lanka Get your Apple devices with warranty in Sri Lanka Francium is the most popular Apple seller in Sri Lanka
Francium: Facts about the elusive radioactive element
Francium — the 87th element on the periodic table — is a naturally occurring, but incredibly rare, radioactive element It forms and decays extremely quickly, so it has no practical uses, and it

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