Search
table of Elements
Francium
Francium X-ray photoelectron spectra, francium electron configuration, and other elemental information.
Join the conversation
Francium • Alkali Metal
Symbol: Fr
Date of discovery: 1939
Name origin: France
Appearance: unknown
Discoverer: Marguerite Perey
Obtained from: decay of actinium
Melting point: 300 K
Boiling point: 950 K
Density[kg/m3]: unknown
Molar volume: unknown
Protons/Electrons: 87
Neutrons: 136
Shell structure: 2,8,18,32,18,8,1
Electron configuration: [Rn]7s1
Oxidation state: 1
Crystal structure: cubic
While its existence was predicted by Mendeleev in the late nineteenth century, francium was discovered in 1939 by Marguerite Perey of the Curie Institute in Paris. She named the new element after her country, France. It is the last element to be discovered in nature and has the lowest electronegativity and electron affinity of all the elements. Francium is the second rarest element found in the earth’s crust. It is the longest-lived isotope of actinium, with a half life of about 22 minutes.
Style Sheet for Global Design System
Style Sheet for Komodo Tabs
Style Sheet to change H3 to p with em-h3-header class
Style Sheet to change H2 style to p with em-h2-header class
재품 표 사항에 대한 스타일시트
Style Sheet for Global Design System
Style Sheet for Komodo Tabs
Style Sheet to change H3 to p with em-h3-header class
Style Sheet to change H2 style to p with em-h2-header class
재품 표 사항에 대한 스타일시트
Fix for left nav
Style Sheet for Support and Service footer
Style Sheet for Fonts
Style Sheet for Cards
재료 과학을 위한 전자 현미경
서비스
최적의 시스템 성능을 보장하기 위해 세계 수준의 현장 서비스 전문가 네트워크, 기술 지원 및 인증된 예비 부품을 제공해드립니다.
