Chemicool

Cooler Than Absolute Zero!




Germanium Element Facts

Data Zone | Discovery | Facts | Appearance & Characteristics | Uses | Abundance & Isotopes | References
32
Ge
72.64

The chemical element germanium is classed as a metalloid. It was discovered in 1886 by Clemens A. Winkler.

Data Zone

Classification: Germanium is a metalloid
Color: gray-white
Atomic weight: 72.64
State: solid
Melting point: 938 oC, 1210.6 K
Boiling point: 2830 oC, 3103 K
Electrons: 32
Protons: 32
Neutrons in most abundant isotope: 42
Electron shells: 2,8,18,4
Electron configuration: [Ar] 3d10 4s2 4p2
Density @ 20oC: 5.323 g/cm3
Show more, including: Heats, Energies, Oxidation,
Reactions, Compounds, Radii, Conductivities
Atomic volume: 13.6 cm3/mol
Structure: diamond structure
Hardness: 6 mohs
Specific heat capacity 0.32 J g-1 K-1
Heat of fusion 36.940 kJ mol-1
Heat of atomization 377 kJ mol-1
Heat of vaporization 334.3 kJ mol-1
1st ionization energy 762.1 kJ mol-1
2nd ionization energy 1537.4 kJ mol-1
3rd ionization energy 3301.7 kJ mol-1
Electron affinity 120 kJ mol-1
Minimum oxidation number -4
Min. common oxidation no. -4
Maximum oxidation number 4
Max. common oxidation no. 4
Electronegativity (Pauling Scale) 2.01
Polarizability volume 6.1 Å3
Reaction with air mild, w/ht ⇒ GeO2
Reaction with 15 M HNO3 mild, ⇒ Geiv, NOx
Reaction with 6 M HCl none
Reaction with 6 M NaOH none
Oxide(s) GeO, GeO2
Hydride(s) GeH4, Ge2H6 + more
Chloride(s) GeCl2, GeCl4
Atomic radius 122.3 pm
Ionic radius (1+ ion) –
Ionic radius (2+ ion) 87 pm
Ionic radius (3+ ion) –
Ionic radius (1- ion) –
Ionic radius (2- ion) –
Ionic radius (3- ion) –
Thermal conductivity 60.2 W m-1 K-1
Electrical conductivity 3 S m-1
Freezing/Melting point: 938 oC, 1210.6 K

Discovery of Germanium

Dr. Doug Stewart

Germanium was one of the elements whose existence was predicted in 1869 by Russian chemist Dmitri Mendeleev, after he noticed a gap between silicon and tin in his periodic table. Mendeleev provisionally called the predicted element eka-silicon.

Germanium was discovered by Clemens A. Winkler in 1886, in Germany, in a mineral sample from a silver mine.

Analysis indicated the sample – a rather rare mineral called argyrodite – contained 73 – 75% silver, 17 – 18% sulfur, 0.2% mercury, and 6 – 7% a new element, which Winkler named germanium.

Mendeleev had predicted the new element’s density would be 5.5 g/cm3 and its atomic weight would be 70.
His predictions proved to be rather good.

Winkler’s name for the element comes from the Latin ‘Germania’ meaning Germany.

 

Germanium

Germanium. Image Ref. (1)

Germanium’s Periodic Table Neighborhood

Group
13
Group
14
Group
15
3 13
Al
14
Si
15
P
4 31
Ga
32
Ge
33
As
5 49
In
50
Sn
51
Sb

Appearance and Characteristics

Harmful effects:

Germanium is not known to be toxic.

Characteristics:

Germanium is a lustrous, hard, gray-white semi-metallic element with a crystalline and brittle structure.

It is a semiconductor.

Germanium and the oxide are transparent to infrared radiation.

Germanium also has the unusual property that (like water) it expands as it freezes.

Four other elements expand when they freeze; silicon, bismuth, antimony and gallium.

Uses of Germanium

The most common use of germanium is as a semiconductor.

Germanium is used in transistors and in integrated circuits.

It is used as an alloying agent and as a catalyst.

It is also used in infrared spectroscopes and infrared detectors.

Some germanium compounds are useful because they are toxic to bacteria but are harmless for mammals.

Abundance and Isotopes

Abundance earth’s crust: 1.5 parts per million by weight, 0.42 parts per million by moles

Abundance solar system: 200 parts per billion by weight, 3 parts per billion by moles

Cost, pure: $360 per100g

Cost, bulk: $120 per 100g

Source: The main ore of germanium is germanite, which is about 7% germanium. Commercially, germanium is obtained as a byproduct of metal refining and from some coal ashes.

Isotopes: Germanium has 24 isotopes whose half-lives are known, with mass numbers 58 to 85. Naturally occurring germanium is a mixture of five isotopes and they are found in the percentages shown: 70Ge (21.2%), 72Ge (27.7%), 73Ge (7.7%), 74Ge (35.9%) and 76Ge (7.4%). The most abundant is 74Ge at 35.9%.

References

  1. Photo: Gibe, GNU Free Documentation License.

Cite this Page

For online linking, please copy and paste one of the following:

<a href="https://www.chemicool.com/elements/germanium.html">Germanium</a>

or

<a href="https://www.chemicool.com/elements/germanium.html">Germanium Element Facts</a>

To cite this page in an academic document, please use the following MLA compliant citation:

"Germanium." Chemicool Periodic Table. Chemicool.com. 26 Jul. 2014. Web.  
<https://www.chemicool.com/elements/germanium.html>.

Comments

  1. Rebecca says

    October 16, 2012 at 5:22 pm

    This is the best website ever it really helps!!!!!!

  2. ginny weasley says

    October 24, 2012 at 1:16 pm

    awesome site

  3. carter says

    October 5, 2017 at 3:46 pm

    give us the answers

    • Doug Stewart says

      October 6, 2017 at 11:23 am

      Give us the questions.

The Elements

A

Actinium – Aluminum – Americium – Antimony – Argon – Arsenic – Astatine

B

Barium – Berkelium – Beryllium – Bismuth – Bohrium – Boron – Bromine

C

Cadmium – Calcium – Californium – Carbon – Cerium – Cesium – Chlorine – Chromium – Cobalt – Copernicium – Copper – Curium

D – E

Darmstadtium – Dubnium – Dysprosium – Einsteinium – Erbium – Europium

F – G

Fermium – Flerovium – Fluorine – Francium – Gadolinium – Gallium – Germanium – Gold

H – I

Hafnium – Hassium – Helium – Holmium – Hydrogen – Indium – Iodine – Iridium – Iron

K – L

Krypton – Lanthanum – Lawrencium – Lead – Lithium – Livermorium – Lutetium

M

Magnesium – Manganese – Meitnerium – Mendelevium – Mercury – Molybdenum – Moscovium

N – O

Neodymium – Neon – Neptunium – Nickel – Nihonium – Niobium – Nitrogen – Nobelium – Oganesson – Osmium – Oxygen

P

Palladium – Phosphorus – Platinum – Plutonium – Polonium – Potassium – Praseodymium – Promethium – Protactinium

R

Radium – Radon – Rhenium – Rhodium – Roentgenium – Rubidium – Ruthenium – Rutherfordium

S

Samarium – Scandium – Seaborgium – Selenium – Silicon – Silver – Sodium – Strontium – Sulfur

T

Tantalum – Technetium – Tellurium – Tennessine – Terbium – Thallium – Thorium – Thulium – Tin – Titanium – Tungsten

U – Z

Uranium – Vanadium – Xenon – Ytterbium – Yttrium – Zinc – Zirconium

Return to top of page

Copyright © 2021 chemicool.com Chemistry Dictionary | Birth of the Elements | Tools | Periodic Table | Citing Chemicool | About | Privacy | Contact

This website uses cookies to improve your experience. We'll assume you're ok with this, but you can opt-out if you wish.Accept Read More
Privacy & Cookies Policy

Privacy Overview

This website uses cookies to improve your experience while you navigate through the website. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. We also use third-party cookies that help us analyze and understand how you use this website. These cookies will be stored in your browser only with your consent. You also have the option to opt-out of these cookies. But opting out of some of these cookies may affect your browsing experience.
Necessary
Always Enabled

Necessary cookies are absolutely essential for the website to function properly. This category only includes cookies that ensures basic functionalities and security features of the website. These cookies do not store any personal information.

Non-necessary

Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. It is mandatory to procure user consent prior to running these cookies on your website.