Element Cobalt

Cobalt ElementCobalt atom is a cobalt group element atom that has atomic number 27. It has a role as a micronutrient. It is a cobalt group element atom and a metal allergen.
Like nickel, cobalt is found in the Earth’s crust only in chemically combined form, save for small deposits found in alloys of natural meteoric iron.
The free element, produced by reductive smelting, is a hard, lustrous, silver-gray metal.
Cobalt is a naturally occurring element found in rocks, soil, water, plants, and animals.
Cobalt is used to produce alloys used in the manufacture of aircraft engines, magnets, grinding and cutting tools, artificial hip and knee joints. Cobalt compounds are also used to color glass, ceramics and paints, and used as a drier for porcelain enamel and paints.

Names and Identifiers

Chemical Formula:Co
CAS:7440-48-4
Molecular Weight:58.93320 g/mol
EC Number :231-158-0
MDL Number:MFCD00010935
Color:lustrous, metallic, grayish tinge /bluish-white
Other Names:Cobaltum, Cobalto, Kobalt, Kobolt
PubChem CID:104730
IUPAC Name:Cobalt
Inchl:InChI=1S/Co
InChI Key:GUTLYIVDDKVIGB-UHFFFAOYSA-N
Canonical SMILES:[Co]
ICSC Number:0782

Physical & Chemical Properties

Phase:Solid
Density:8.90 g/cm³
Boiling Point:3200 K ​(2927 °C, ​5301 °F)
Melting Point:1768 K ​(1495 °C, ​2723 °F)
Molecular Formula:Co
Flash Point:n/a
Exact Mass:58.93320
Symbol:Globally Harmonized System of Classification
Signal Word:Danger
Hazard Statements:H317-H334-H413
Precautionary Statements:P261-P280-P342 + P311
Hazard Codes:Xn:Harmful
Risk Phrases:R42/43;R53
Safety Phrases:S53-S23-S26-S36/37/39-S45-S61-S37-S24-S22-S36/37-S5
RIDADR:UN 3264 8/PG 3
WGK Germany:3
RTECS:GF8750000
Packaging Group:III
Hazard Class:4.1

Naturally occurring cobalt consists of a single stable isotope: 59Co. Cobalt-59 has spin 7/2.
The usual NMR reference is K3[Co(CN)6] in D2O. Cobalt-60 is an artifical isotope, and is an important γ-ray source.

Naturally occurring isotopes

IsotopeMass/DaNatural abundance (atom %)Nuclear spin (I)Magnetic moment (μ/μN)
59Co58.9331976 (16)1007/24.627

Radiosotope data

IsotopeMass/DaHalf-lifeMode of decayNuclear spinNuclear magnetic moment
55Co54.94200317.53 hEC to 55Fe7/24.822
56Co55.93984477.3 dEC to 56Fe43.85
57Co56.936296271.8 dEC to 57Fe7/24.72
58Co57.93575770.88 dEC to 58Fe24.04
60Co59.9338225.271 yβ to 60Ni53.799
61Co60.9324791.650 hβ to 61Ni7/2
62Co61.9340513.9 mβ to 62Ni2

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