25
54.94
Mn
Manganese
Identification
CAS Number: 7439-96-5
Discovery Year: 1774
Discoverer: Johann Gahn
Discovery Location: Sweden
Properties
Atomic Dimensions
Atomic Radius: 140 pm →
Atomic Radius (Rahm): 242 pm
Covalent Radius: 150 pm →Van der Waals Radius: 204.99999999999997 pm
Metallic Radius: 118 pm
Atomic Volume: 7.39 cm³/mol
Lattice Constant: 8.89 Å
Thermodynamics
Electronic Structure
Electron Config: [Ar] 3d5 4s2
Block: d
Period: 4 →Group: 7 →Electronegativity: 1.55 →Oxidation States: +2, +3, +4, +6, +7
Abundance & Geochemistry
Crust Abundance: 950 mg/kg
Sea Abundance: 0.0002 mg/L
Geochemical Class: first series transition metal
Goldschmidt Class: siderophile
About
Grey brittle metallic transition element. Rather electropositive, combines with some non-metals when heated. Discovered in 1774 by Scheele.
Isotopes
Mn-55 55 100.00%
