Radium (Ra)

Properties

Abundance
CAS Number	7440-14-4
PubChem CID	6328144
Atomic Radius	-
Atomic Volume	45.2
Atomic Weight	[226]
Block	s
Boiling Point	1,737
Bulk Modulus
Category	Alkaline earth metals
Crystal Structure	Body Centered Cubic
Color	Silver
Covalent Radius	221
Density	5.5
Electrical Resistivity
Electron Configuration	[Rn] 7s²
Electrons per shell	2, 8, 18, 32, 18, 8, 2
Electronegativity	0.9
Electrons	88
Group	2
Heat of Fusion	8
Heat of Vaporization	125
Ionization Potential	5.278
Magnetic Ordering
Magnetic Susceptibility
Mass	[226]
Mass Number	88
Melting Point	700
Name	Radium
Neutrons	138
Atomic Number	226
Oxidation States	2
Period	7
Phase	Solid
Poisson Ratio
Protons	88
Shear Modulus
Specific Heat Capacity	-
Symbol	Ra
Thermal Conductivity	0.186
Van der Waals radius
Young's Modulus
Abundance in Earth's crust	9.9×10^-12%
Abundance in Universe	na

Ra Radium 88 (226) 2 7 s 88 700.0 1140.0 [Rn] 7s2 2 8 18 32 18 8 2 5.0 9.9E-12% Silver Cubic: Body centered 0.9 {"1":"509.3","2":"979.0"} 509 2 2.33 45.2 8.37 136.82 0.094 18.6 1 1.59×10³³y AlphaEmission Solid, Conductor, AlkalineEarthMetal, Metal, Radioactive, Natural RAY-di-em Silvery-white metal. Intensely radioactive. Used in treating cancer because of the gamma rays it gives off. Found in uranium ores at 1 part per 3 million parts uranium. 5_I6vj-lXNM Radium

In 1911, Georges Urbain claimed to have found the element in rare-earth residues which was shown later to be a mixture of already discovered lanthanides.

Dirk Coster and George de Hevesy found it by X-ray spectroscopic analysis in Norwegian zircon in 1922.

Anton Eduard van Arkel and Jan Hendrik de Boer were the first to prepare metallic hafnium by passing hafnium tetra-iodide vapor over a heated tungsten filament in 1924. From Hafinia, the Latin name for Copenhagen 88 1898 Pierre and Marie Curie France From the Latin word "radius" meaning "ray"

Isotopes of Hafnium

Standard Atomic Weight

[226]

Stable Isotopes

Unstable Isotopes

²⁰²Ra ²⁰³Ra ²⁰⁴Ra ²⁰⁵Ra ²⁰⁶Ra ²⁰⁷Ra ²⁰⁸Ra ²⁰⁹Ra ²¹⁰Ra ²¹¹Ra ²¹²Ra ²¹³Ra ²¹⁴Ra ²¹⁵Ra ²¹⁶Ra ²¹⁷Ra ²¹⁸Ra ²¹⁹Ra ²²⁰Ra ²²¹Ra ²²²Ra ²²³Ra ²²⁴Ra ²²⁵Ra ²²⁶Ra ²²⁷Ra ²²⁸Ra ²²⁹Ra ²³⁰Ra ²³¹Ra ²³²Ra ²³³Ra ²³⁴Ra

Hafnium is considered to be non-toxic

In powdered form, hafnium is pyrophoric and can ignite spontaneously in air

Hafnium oxide-based compounds are being introduced into silicon-based chips to produce smaller, more energy efficient and performance packed processors.

Most of the hafnium produced is used in the production of control rods for nuclear reactors.

Hafnium is also used in photographic flash bulbs, light bulb filaments, and in electronic equipment as cathodes and capacitors.

Radium on ChemicalAid