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Periodic Table of Elements

Element Germanium – Ge

Comprehensive data on the chemical element Germanium is provided on this page; including scores of properties, element names in many languages, most known nuclides of Germanium. Common chemical compounds are also provided for many elements. In addition technical terms are linked to their definitions and the menu contains links to related articles that are a great aid in one studies. Using the "Periodic Table of Elements Quick Navigation" graphic at the bottom of the sidebar menu, one can quickly jump from chemical element to chemical element.

Germanium Menu

• Germanium Page One
  • Overview of Germanium
  • Germanium's Name in Other Languages
  • Atomic Structure of Germanium
  • Chemical Properties of Germanium
  • Physical Properties of Germanium
  • Regulatory / Health
  • Who/When/Where/How
• Germanium Page Two
  • Nuclides / Isotopes
  • Potential Parent Nuclides
• Germanium Page Three
  • Common Chemical Compounds of Germanium

Overview of Germanium

• Atomic Number:32
• Group: 14
• Period: 4
• Series: Metalloids (Metals)

Germanium's Name in Other Languages

• Latin: Germanium
• Czech: Germanium
• Croatian: Germanij
• French: Germanium
• German: Germanium - s
• Italian: Germanio
• Norwegian: Germanium
• Portuguese: Germânio
• Russian:
• Spanish: Germánio
• Swedish: Germanium

Atomic Structure of Germanium

• Atomic Radius: 1.52Å
• Atomic Volume: 13.6cm³/mol
• Covalent Radius: 1.22Å
• Cross Section (Thermal Neutron Capture)_a/barns: 2.2
• Crystal Structure: Cubic face centered

  

• Electron Configuration:

  1s² 2s²p⁶ 3s²p⁶d¹⁰ 4s²p²

• Electrons per Energy Level: 2,8,18,4

  Shell Model
  

• Ionic Radius: 0.53Å
• Filling Orbital: 4p²
• Number of Electrons (with no charge): 32
• Number of Neutrons (most common/stable nuclide): 41
• Number of Protons: 32
• Oxidation States: 4
• Valence Electrons: 4s²p²

  Electron Dot Model
  

Chemical Properties of Germanium

• Electrochemical Equivalent: 0.6771g/amp-hr
• Electron Work Function: 5eV
• Electronegativity: 2.01 (Pauling); 2.02 (Allrod Rochow)
• Heat of Fusion: 36.94kJ/mol
• Incompatibilities:

  Acids

• Ionization Potential
  • First: 7.899
  • Second: 15.934
  • Third: 34.22
• Valence Electron Potential (-eV): 109

Physical Properties of Germanium

• Atomic Mass Average: 72.61
• Boiling Point: 3103K 2830°C 5126°F
• Coefficient of lineal thermal expansion/K^-1: 5.57E^-6
• Conductivity

  Electrical: 1.45E^-8 10⁶/cm
  Thermal: 0.599 W/cmK

• Density: 5.323g/cc @ 300K
• Description:

  Hard brittle grayish-white metalloid that is stable in air and water. It is unaffected by acids (except HNO₃) and alkalis.

• Elastic Modulus:
  • Rigidity: 29.6/GPa
  • Youngs: 79.9/GPa
• Enthalpy of Atomization: 376.6 kJ/mole @ 25°C
• Enthalpy of Fusion: 34.7 kJ/mole
• Enthalpy of Vaporization: 334.3 kJ/mole
• Flammablity Class: Combustible Solid, fine dust is easily ignited
• Freezing Point: see melting point
• Hardness Scale
  • Mohs: 6
• Heat of Vaporization: 330.9kJ/mol
• Melting Point: 1210.55K 937.4°C 1719.3°F
  
• Molar Volume: 13.57 cm³/mole
• Physical State (at 20°C & 1atm): Solid
• Specific Heat: 0.32J/gK
• Vapor Pressure = 0.0000746Pa@937.4°C

Regulatory / Health

• CAS Number
  • 7440-56-4
• RTECS: 1008063GE
• OSHA Permissible Exposure Limit (PEL)
  • No limits set by OSHA
• OSHA PEL Vacated 1989
  • No limits set by OSHA
• NIOSH Recommended Exposure Limit (REL)
  • No limits set by NIOSH
• Levels In Humans:
  Note: this data represents naturally occuring levels of elements in the typical human, it DOES NOT represent recommended daily allowances.
  • Blood/mg dm^-3: 0.44
  • Bone/p.p.m: n/a
  • Liver/p.p.m: 0.15
  • Muscle/p.p.m: 0.14
  • Daily Dietary Intake: 0.4-1.5 mg
  • Total Mass In Avg. 70kg human: 5 mg

Who / Where / When / How

• Discoverer: Clemens A Winkler
• Discovery Location: Freiberg Germany
• Discovery Year: 1886
• Name Origin:

  Latin: Germania (Germany).

• Abundance of Germanium:
  • Earth's Crust/p.p.m.: 1.8
  • Seawater/p.p.m.:
    • Atlantic Suface: 7E-08
    • Atlantic Deep: 1.4E-07
    • Pacific Surface: 3.5E-07
    • Pacific Deep: 0.000006
  • Atmosphere/p.p.m.: N/A
  • Sun (Relative to H=1E¹²): 3160
• Sources of Germanium:

  Obtained from refining copper, zinc and lead. Annual world wide production is around 80 tons.

• Uses of Germanium:

  Widely used in semiconductors, infrared prisms, reflectors in projectors, wide angle lenses and dentistry.

• Additional Notes:

  In the elemental form it is a lustrous white, brittle metaloid. When crystalized it has a diamond cubic structure. It is a poor conductor and is used in electronics in rectifying devices and transistors. It is also used in dental alloys. There are several compounds which contain germanium. "Germaine" or germanium hydride is a colorless gas GeH4 prepared by the action of lithium aluminum hydride on germanium halide in an ether solution. Germaine is a hazardous substance UN2192 which is classified as a poisonous gas (2.3). It is also a flammable gas (2.1). Other compounds include : Germanium dichloride Ge Cl₂, Germanium dioxide GeO₂, Germanium tetrachloride GeCl₄ this is very irritating to eyes and membranes.

[Last update: 2/22/2007]

Notes below

Germanium Menu

• Germanium Page One
  • Overview of Germanium
  • Germanium's Name in Other Languages
  • Atomic Structure of Germanium
  • Chemical Properties of Germanium
  • Physical Properties of Germanium
  • Regulatory / Health
  • Who/When/Where/How
• Germanium Page Two
  • Nuclides / Isotopes
  • Potential Parent Nuclides
• Germanium Page Three
  • Common Chemical Compounds of Germanium

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• Chemical Database
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Citing this page

If you need to cite this page, you can copy this text:

Kenneth Barbalace. Periodic Table of Elements - Germanium – Ge. EnvironmentalChemistry.com. 1995 - 2009. Accessed on-line: 1/8/2009
http://EnvironmentalChemistry.com/yogi/periodic/Ge.html
.