Properties

CAS Number10028-14-5
PubChem CIDna
Atomic Radius-
Atomic Volume-
Atomic Weight[259]
Blockf
Boiling Point-
Bulk Modulus
CategoryActinides
Crystal Structure
Color
Covalent Radius-
Density-
Electrical Resistivity
Electron Configuration[Rn] 5f14 7s2
Electrons per shell2, 8, 18, 32, 32, 8, 2
Electronegativity1.3
Electrons102
Groupna
Heat of Fusionna
Heat of Vaporizationna
Ionization Potential6.65
Magnetic Ordering
Magnetic Susceptibility
Mass[259]
Mass Number102
Melting Point827
NameNobelium
Neutrons157
Atomic Number259
Oxidation States2, 3
Period7
PhaseSolid
Poisson Ratio
Protons102
Shear Modulus
Specific Heat Capacity-
SymbolNo
Thermal Conductivity0.1
Van der Waals radius
Young's Modulus
Abundance
Abundance in Earth's crustna
Abundance in Universena
No Nobelium 102 (259) 7 f 102 [Rn] 5f14 7s2 2 8 18 32 32 8 2 None Unknown 1.3 {"1":"642"} 642 +2,3 10.0 1 2.78 h 5.56h AlphaEmission Actinide, Radioactive, Synthetic no-BELL-i-em Synthetic radioactive metal. It has no significant commercial applications. Made by bombarding curium with carbon-13 t_ZpauMxapY Nobelium
In 1869, existence of astatine was first predicted by Russian chemist Dmitri Mendeleev and called the element eka-iodine.

In 1940, Dale R. Corson, Kenneth Ross MacKenzie, and Emilio Segrè isolated the element at the University of California, Berkeley.

Instead of searching for the element in nature, the scientists created it by bombarding bismuth-209 with alpha particles. From the Greek astatos meaning unstable 102 1958 Nobel Institute for Physics and later by Seaborg and others at Berkeley, California, USA Sweden, USA Named after Alfred "Nobel", Swedish chemist who discovered dynamite, and founder of the Nobel Prizes

Isotopes of Astatine

Standard Atomic Weight

Stable Isotopes

Unstable Isotopes

248No 249No 250No 251No 252No 253No 254No 255No 256No 257No 258No 259No 260No 261No 262No 263No 264No

Astatine is highly radioactive
Astatine is preferentially concentrated in the thyroid gland
The newly formed astatine-211 is important in nuclear medicine.

Once produced, astatine must be used quickly, as it decays with a half-life of 7.2 hours.

Astatine-211 can be used for targeted alpha particle radiotherapy, since it decays either via emission of an alpha particle.