Element Manganese
It 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: |  |
| 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
| Isotope | Mass/Da | Natural abundance (atom %) | Nuclear spin (I) | Magnetic moment (μ/μN) |
|---|---|---|---|---|
| 55Mn | 54.9380471 (16) | 100 | 5/2 | 3.4532 |
Radiosotope data
| Isotope | Mass/Da | Half-life | Mode of decay | Nuclear spin | Nuclear magnetic moment |
|---|---|---|---|---|---|
| 51Mn | 50.948215 | 46.2 m | EC to 51Cr | ||
| 52Mn | 51.945570 | 5.591 d | EC to 52Cr | 6 | 3.063 |
| 53Mn | 52.941294 | 3.7 x 106 y | EC to 53Cr | 7/2 | 5.024 |
| 54Mn | 53.940363 | 312.2 d | EC to 54Cr; β– to 54Fe | 3 | 3.282 |
| 56Mn | 55.938909 | 2.579 h | β– to 56Fe | 3 | 3.2266 |
| 57Mn | 56.938287 | 1.45 m | β– to 57Fe | 5/2 |