francium

element 87|catium|eka-cesium|eka-caesium

Francium

chemical element with symbol Fr and atomic number 87

Francium (Element - 87) 1.jpg

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Fr

Chemical element with atomic number 87 (Fr)

<span lang="en" dir="ltr"><span class="mw-page-title-main">Francium</span></span>

Francium is a chemical element; it has symbol Fr and atomic number 87. It is extremely radioactive; its most stable isotope, francium-223, 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. Francium's isotopes decay quickly into astatine, radium, and radon. The electronic structure of a francium atom is [Rn] 7s1; thus, the element is classed as an alkali metal.

en

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Francium

standard