Element Manganese

Manganese ElementIt is a chemical element with the symbol Mn and atomic number 25. It is not found as a free element in nature; it is often found in minerals in combination with iron.
Manganese is a transition metal with important industrial alloy uses, particularly in stainless steels.
Manganese atom is a manganese group element atom. It has a role as an Escherichia coli metabolite and a micronutrient.
Manganese is a naturally occurring metal that is found in many types of rocks. Pure manganese is silver-colored, but does not occur naturally. It combines with other substances such as oxygen, sulfur, or chlorine. Manganese can also be combined with carbon to make organic manganese compounds.

Names and Identifiers

Chemical Formula:Mn
CAS:7439-96-5
Molecular Weight:54.93800 g/mol
EC Number :231-105-1
MDL Number:MFCD00011111
Color:silvery metallic
Other Names:Manganum, Manganesio, Manganês
PubChem CID:23930
IUPAC Name:Manganese
Inchl:InChI=1S/Mn
InChI Key:PWHULOQIROXLJO-UHFFFAOYSA-N
Canonical SMILES:[Mn]
ICSC Number:0174

Physical & Chemical Properties

Phase:Solid
Density:7.21 g/cm³
Boiling Point:2334 K ​(2061 °C, ​3742 °F)
Melting Point:1519 K ​(1246 °C, ​2275 °F)
Molecular Formula:Mn
Flash Point:n/a
Exact Mass:54.93800
Symbol:Globally Harmonized System of Classification
Signal Word:Danger
Hazard Statements:H260
Precautionary Statements:n/a
Hazard Codes:F:Highlyflammable
Risk Phrases:R11
Safety Phrases:S45-S43-S26-S36-S36/37/39-S27
RIDADR:UN 3264 8/PG 3
WGK Germany:2
RTECS:OO9625000
Packaging Group:III
Hazard Class:8

Naturally occurring manganese is composed of one stable isotope, 55Mn.
Eighteen radioisotopes have been isolated and described, ranging in atomic weight from 46 u (46Mn) to 65 u (65Mn).
The most stable are 53Mn with a half-life of 3.7 million years, 54Mn with a half-life of 312.3 days

Naturally occurring isotopes

IsotopeMass/DaNatural abundance (atom %)Nuclear spin (I)Magnetic moment (μ/μN)
55Mn54.9380471 (16)1005/23.4532

Radiosotope data

IsotopeMass/DaHalf-lifeMode of decayNuclear spinNuclear magnetic moment
51Mn50.94821546.2 mEC to 51Cr
52Mn51.9455705.591 dEC to 52Cr63.063
53Mn52.9412943.7 x 106 yEC to 53Cr7/25.024
54Mn53.940363312.2 dEC to 54Cr; β to 54Fe33.282
56Mn55.9389092.579 hβ to 56Fe33.2266
57Mn56.9382871.45 mβ to 57Fe5/2

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