25 · Mn
Manganese
Isolated by Gahn in 1774.
Identity
- Atomic number
- 25
- Symbol
- Mn
- Canonical name
- Manganese
- Category
- transition metal
- Group
- 7
- Period
- 4
- Block
- d
Properties
These quantities come from the Periodic Table JSON compilation. They have not yet been checked, one by one, against CIAAW atomic weights or NIST measurements. A value marked estimated is not a measurement.
- Atomic mass
- 54.938044 u
- Electron configuration
- [Ar] 3d5 4s2
- Electrons per shell
- 2, 8, 13, 2
- Standard state
- solid
- Density
- 7.21 g/cm³
- Melting point
- 1,519 K
- Boiling point
- 2,334 K
- Electronegativity
- 1.55 Pauling
- First ionization energy
- 717.3 kJ/mol
- Electron affinity
- -50 kJ/mol
Notable isotopes
This summary is not an inventory of every isotope.
- Mn-55 · 100 % · stable
History
Metal isolated
Isolation · confirmed · 1774
Gahn isolates manganese. Scheele had recognized the particular nature of pyrolusite, without being the author of this isolation.
Etymology
- Theme
- place
- Language
- latin
- Root
- magnes
- Meaning
- Magnesia, as in black magnesia
Scientists
Places and institutions
- Stockholm — historical setting : Sweden — present country : Sweden
See also
Sources
- IUPAC, Periodic Table of the Elements
- Bowserinator, Periodic Table JSON. Compilation secondaire d’où viennent les grandeurs physiques importées (masse, densité, températures, énergies). Elles ne sont pas revérifiées une à une auprès du NIST ou de la CIAAW.
- John Emsley, Nature’s Building Blocks: An A–Z Guide to the Elements