Periodic table

 

 

Atomic number:76

Group numbers:8

Period:6

Electronic configuration:[Xe] 4f¹⁴ 5d⁶ 6s²

Formal oxidation number:+3 +4

Electronegativities:2.2

Atomic radius / pm:133.8

Relative atomic mass:190.23 ± 0.03

 

Osmium was discovered by Smithson Tennant (GB) in 1803. The origin of the name comes from the Greek word osme meaning smell. It is a hard fine black powder or hard, lustrous, blue-white metal. Osmium is unaffected by air, water and acids. It has a characteristic acrid, chlorine like odour due to tetroxide compound. Osmium tetroxide is highly toxic. Osmium is obtained from the same ores as platinum. It is used to tip gold pen points, instrument pivots, to make electric light filaments, and also used for high temperature alloys and pressure bearings. Osmium is very hard and resists corrosion better than any other element.

PHYSICAL PROPERTIES

Density / g dm^-3:22590 (293 K)

 20100 (m.p.)

Molar volume / cm³mol^-1:8.42 (293 K)

 9.46 (m.p.)

Electrical resistivity / μΩcm:9.5 (20 °C)

THERMAL PROPERTIES

Thermal conductivity / W m^-1K^-1:87.6

Melting point / °C:3033

Boiling point / °C:5012

Heat of fusion / kJ mol^-1:29.3

Heat of vaporization / kJ mol^-1:738.06

Heat of atomization / kJ mol^-1:791

IONIZATION ENERGIES

First ionization energy / kJ mol^-1:814.17

Second ionization energy / kJ mol^-1:-

Third ionization energy / kJ mol^-1:-

ABUNDANCE OF ELEMENTS

in the atmosphere / ppm:-

in the Earth's crust / ppm:0.005

in the oceans / ppm:-

CRYSTALLOGRAPHIC DATA

ISOTOPES

REDUCTION POTENTIALS

 

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Citing this page:

Generalic, Eni. "Osmium." EniG. Periodic Table of the Elements. 16 May 2013. KTF-Split. {Date of access}. <http://www.periodni.com/os.html>.