Element Ruthenium

Ruthenium ElementElement Ruthenium is a chemical element with the symbol Ru and atomic number 44. It is a rare transition metal belonging to the platinum group of the periodic table.
A polyvalent hard white metal, ruthenium is a member of the platinum group. Like the other metals of the platinum group, ruthenium is inert to most chemicals. Most ruthenium is used for wear-resistant electrical contacts and the production of thick-film resistors. A minor application of ruthenium is its use in some platinum alloys

Names and Identifiers

Chemical Formula:Ru
CAS:7440-18-8
Molecular Weight:101.070 g/mol
EC Number :231-127-1
MDL Number:MFCD00011207
Color:silvery white metallic/ silvery-white
Other Names:Ruthénium, Rutenio, Rutênio
PubChem CID:23950
IUPAC Name:Ruthenium
Inchl:InChI=1S/Ru
InChI Key:KJTLSVCANCCWHF-UHFFFAOYSA-N
Canonical SMILES:[Ru]
ICSC Number:n/a

Physical & Chemical Properties

Phase:Solid
Density:12.45g/cm³
Boiling Point:4423 K ​(4150 °C, ​7502 °F)
Melting Point:2607 K ​(2334 °C, ​4233 °F)
Molecular Formula:Ru
Flash Point:134.3ºC
Exact Mass:101.904388
Symbol:Globally Harmonized System of Classification
Signal Word:Danger
Hazard Statements:H228
Precautionary Statements:P210
Hazard Codes:F:Highlyflammable;
Risk Phrases:20-37-11
Safety Phrases:S24/25
RIDADR:UN 3178 4.1/PG 2
WGK Germany:3
RTECS:n/a
Packaging Group:III
Hazard Class:4.1

Naturally occurring ruthenium is composed of seven stable isotopes. Additionally, 34 radioactive isotopes have been discovered.
Of these radioisotopes, the most stable are 106Ru with a half-life of 373.59 days, 103Ru with a half-life of 39.26 days and 97Ru with a half-life of 2.9 days.

Naturally occurring isotopes

IsotopeMass/DaNatural abundance (atom %)Nuclear spin (I)Magnetic moment (μ/μN)
96Ru95.907599 (8)5.54 (14)0
98Ru97.905287 (7)1.87 (3)0
99Ru98.9059389 (23)12.76 (14)5/2-0.6413
100Ru99.9042192 (24)12.60 (7)0
101Ru100.9055819 (24)17.06 (2)5/2-0.7189
102Ru101.9043485 (25)31.55 (14)0
104Ru103.905424 (6)18.62 (27)0

Radiosotope data

IsotopeMass/DaHalf-lifeMode of decayNuclear spinNuclear magnetic moment
95Ru94.910421.64 hEC to 95Tc5/2
97Ru96.907562.89 dEC to 97Tc5/2-0.78
103Ru102.90632339.27 dβ to 103Rh3/20.20
105Ru104.9077504.44 hβ to 105Rh3/2-0.3
106Ru105.907331.020 yβ to 106Rh0

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