Periodic System for Chemists
Table
25
54.94

Mn

Manganese

Identification

CAS Number: 7439-96-5
Discovery Year: 1774
Discoverer: Johann Gahn
Discovery Location: Sweden

Properties

Atomic Mass: 54.938044 →Density: 7.3 g/cm³ →
Crust Abundance: 950 mg/kg
Crystal Structure: CUB

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

Melting Point: 1517 K →Boiling Point: 2235 K →Specific Heat: 0.477 J/(g·K) →Heat of Fusion: 13.4 kJ/mol →Heat of Vaporization: 221 kJ/mol →
Heat of Formation: 283.3 kJ/mol

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%