• Class: Halogens
• Period: 6
• IUPAC group: 17
• Traditional: VIIb

• Discovered in: 1940 by Corson et. al.
• Origin of name: Greek: astatos, (unsTABLE)
• Historical or alternate name:

Minute quantities occurring with uranium & thorium isotopes

• Atmosphere: ~0.0 ppm
• Primitive mantle: ~0.0 ppm
• Sea water: ~0.0 ppm
• Metallic meteorite: ~0.0 ppm
• ConTinental crust: ~0.0 ppm
• Solar photosphere: ~0.0 log of abundance
• Oceanic crust: ~0.0 ppm
• Solar system: ~0.0 relative to Si=1.0e6

   Hazards

Radioactive..

• Lower:
• Upper:

Astatine Physical Properties

 Transitional Data

• State: Solid
• Density: g/cm3

 Molar enthalpy

• Atomization: 91.0 kJ mol-1
• Fusion: 23.8 kJ mol-1
• Vaporization: kJ mol-1

 Transition points

• MelTing point: 575.0 K
• Boiling point: 610.0 K
• Critical temperature: 1060.0 K

 Molar properties

• Atomic weight: 209.9871 g/mole
• Molar volume: cm3 mol-1

 Crystal structure sequence

 Thermodynamics

 Miscellaneous physical

• Electrical resistivity: µ-ohms/cm
• Debye temperature: K
• Thermal conductivity: W / m / K
• Coefficient of linear expansion: Coef. per K
• Mass magnetic susceptibility:
• X-ray diffraction mass absorption coefficients:
• CuK: (µ/p)/cm2 g-1
• MoK: (µ/p)/cm2 g-1

Astatine Chemical Properties

 Chemical basics:

• Oxidation states: -1 +1 +5 +7
• Molecular wt: 209.9871 g/mole

 Radii

• Covalent: pm
• Atomic: 145.0 pm
• Van der Waals: pm

 Ions:

• ion: -1 pm 227.0
• ion: +7 pm 62.0

 Covalent bonds

 Effective nuclear charge

• Slater: 7.60
• Clementi: 15.16
• Froese-Fischer: 19.61

 Electronegativity

• Pauling: 2.2
• Allred-Rochow: 1.96

 Standard reactions

Astatine Nuclear Properties

• Known 21
• Listed 21

• Known 200 - 219
• Listed 200 - 220

• % Occ.:Natural
• Mossbauer NRA:
• Nuclear spin/Quantum no.:
• Radioisotopes:
  • Half-life: 0.3 E6 years
  • Decay mode: E.C.,
  • Source:
• Notes

• % Occ.:Natural 1.4%
• Mossbauer NRA:
• Nuclear spin/Quantum no.:
• Radioisotopes:
  • Half-life: 1.4 E17 years
  • Decay mode: alpha,
  • Source:
• Notes

• % Occ.:Natural
• Mossbauer NRA:
• Nuclear spin/Quantum no.: 5/2
• Radioisotopes:
  • Half-life: 15.0 E6 years
  • Decay mode: E.C.,
  • Source:
• Notes

• % Occ.:Natural 24.1%
• Mossbauer NRA:
• Nuclear spin/Quantum no.:
• Radioisotopes:
  • Half-life:
  • Decay mode:
  • Source:
• Notes

• % Occ.:Natural 22.1%
• Mossbauer NRA:
• Nuclear spin/Quantum no.: 1/2
• Radioisotopes:
  • Half-life:
  • Decay mode:
  • Source:
• Notes

• % Occ.:Natural 52.4%
• Mossbauer NRA:
• Nuclear spin/Quantum no.:
• Radioisotopes:
  • Half-life:
  • Decay mode:
  • Source:
• Notes

• % Occ.:Natural
• Mossbauer NRA:
• Nuclear spin/Quantum no.:
• Radioisotopes:
  • Half-life: 21.4 years
  • Decay mode: Beta- alpha,
  • Source:
• Notes date med

• % Occ.:Natural
• Mossbauer NRA:
• Nuclear spin/Quantum no.:
• Radioisotopes:
  • Half-life: 0.3 E6 years
  • Decay mode: E.C.,
  • Source:
• Notes

• % Occ.:Natural 1.4%
• Mossbauer NRA:
• Nuclear spin/Quantum no.:
• Radioisotopes:
  • Half-life: 1.4 E17 years
  • Decay mode: alpha,
  • Source:
• Notes

• % Occ.:Natural
• Mossbauer NRA:
• Nuclear spin/Quantum no.: 5/2
• Radioisotopes:
  • Half-life: 15.0 E6 years
  • Decay mode: E.C.,
  • Source:
• Notes

• % Occ.:Natural 24.1%
• Mossbauer NRA:
• Nuclear spin/Quantum no.:
• Radioisotopes:
  • Half-life:
  • Decay mode:
  • Source:
• Notes

• % Occ.:Natural 22.1%
• Mossbauer NRA:
• Nuclear spin/Quantum no.: 1/2
• Radioisotopes:
  • Half-life:
  • Decay mode:
  • Source:
• Notes

• % Occ.:Natural 52.4%
• Mossbauer NRA:
• Nuclear spin/Quantum no.:
• Radioisotopes:
  • Half-life:
  • Decay mode:
  • Source:
• Notes

• % Occ.:Natural
• Mossbauer NRA:
• Nuclear spin/Quantum no.:
• Radioisotopes:
  • Half-life: 21.4 years
  • Decay mode: Beta- alpha,
  • Source:
• Notes date med

• % Occ.:Natural
• Mossbauer NRA:
• Nuclear spin/Quantum no.:
• Radioisotopes:
  • Half-life: 0.3 E6 years
  • Decay mode: E.C.,
  • Source:
• Notes

• % Occ.:Natural 1.4%
• Mossbauer NRA:
• Nuclear spin/Quantum no.:
• Radioisotopes:
  • Half-life: 1.4 E17 years
  • Decay mode: alpha,
  • Source:
• Notes

• % Occ.:Natural
• Mossbauer NRA:
• Nuclear spin/Quantum no.: 5/2
• Radioisotopes:
  • Half-life: 15.0 E6 years
  • Decay mode: E.C.,
  • Source:
• Notes

• % Occ.:Natural 24.1%
• Mossbauer NRA:
• Nuclear spin/Quantum no.:
• Radioisotopes:
  • Half-life:
  • Decay mode:
  • Source:
• Notes

• % Occ.:Natural 22.1%
• Mossbauer NRA:
• Nuclear spin/Quantum no.: 1/2
• Radioisotopes:
  • Half-life:
  • Decay mode:
  • Source:
• Notes

• % Occ.:Natural 52.4%
• Mossbauer NRA:
• Nuclear spin/Quantum no.:
• Radioisotopes:
  • Half-life:
  • Decay mode:
  • Source:
• Notes

• % Occ.:Natural
• Mossbauer NRA:
• Nuclear spin/Quantum no.:
• Radioisotopes:
  • Half-life: 21.4 years
  • Decay mode: Beta- alpha,
  • Source:
• Notes date med

Astatine Energy Properties

Electrons

• Ground state electron configuration: [Xe] 4f14 5d10 6s2 6p5
• Electron affinity: 270 kJ mol-1
• Filling orbitals:

 Ionization energies

 Atomic energy levels