Франциум (Fr)

Properties

Abundance
CAS Number	7440-73-5
PubChem CID	na
Atomic Radius	260
Atomic Volume	71,07
Atomic Weight	[223]
Block	s
Boiling Point	677
Bulk Modulus
Category	Alkali metals
Crystal Structure
Color	Silver
Covalent Radius	348
Density	1,87
Electrical Resistivity
Electron Configuration	[Rn] 7s¹
Electrons per shell	2, 8, 18, 32, 18, 8, 1
Electronegativity	0,7
Electrons	87
Group	1
Heat of Fusion	2
Heat of Vaporization	65
Ionization Potential	4,073
Magnetic Ordering
Magnetic Susceptibility
Mass	[223]
Mass Number	87
Melting Point	23
Name	Франциум
Neutrons	136
Atomic Number	223
Oxidation States	1
Period	7
Phase	Solid
Poisson Ratio
Protons	87
Shear Modulus
Specific Heat Capacity	-
Symbol	Fr
Thermal Conductivity	0,15
Van der Waals radius
Young's Modulus
Abundance in Earth's crust	na
Abundance in Universe	na

Fr Франциум 87 (223) 1 7 s 87 27.0 677.0 [Rn] 7s1 2 8 18 32 18 8 1 N/A Silver Cubic: Body centered 0.7 {"1":"380"} 380 -44 1 2.7 2.1 64.0 15.0 1 21.7 m 31.7m BetaDecay Solid, AlkaliMetal, Metal, Radioactive, Natural FRAN-si-em Highly rare and unstable, radioactive metal. Since its isotopes have such short half-lives there are no commercially significant compounds of francium. Formed by decay of actinium. Chemical properties similar to cesium. Decays to radium or astatine. PyFLvSg6ZDw Francium

French chemist Georges Urbain successfully separated lutetium from ytterbia in 1907 in Paris.

Austrian scientist Carl Auer von Welsbach and American chemist Charles James also succeeded in isolating lutetium independently in the same year.

Pure lutetium metal was first produced in 1953. Lutetia is the ancient name for Paris 87 1939 Marguerite Perey France Named after "France"

Isotopes of Lutetium

Standard Atomic Weight

[223]

Stable Isotopes

Unstable Isotopes

¹⁹⁹Fr ²⁰⁰Fr ²⁰¹Fr ²⁰²Fr ²⁰³Fr ²⁰⁴Fr ²⁰⁵Fr ²⁰⁶Fr ²⁰⁷Fr ²⁰⁸Fr ²⁰⁹Fr ²¹⁰Fr ²¹¹Fr ²¹²Fr ²¹³Fr ²¹⁴Fr ²¹⁵Fr ²¹⁶Fr ²¹⁷Fr ²¹⁸Fr ²¹⁹Fr ²²⁰Fr ²²¹Fr ²²²Fr ²²³Fr ²²⁴Fr ²²⁵Fr ²²⁶Fr ²²⁷Fr ²²⁸Fr ²²⁹Fr ²³⁰Fr ²³¹Fr ²³²Fr

Lutetium is considered to be non toxic

Lutetium was the last natural rare earth element to be discovered

Lutetium oxide is used to make catalysts for cracking hydrocarbons in the petrochemical industry.

Lutetium aluminum garnet has been proposed for use as a lens material in high refractive index immersion lithography.

Lutetium is used as a phosphor in LED light bulbs.

Франциум on ChemicalAid