Periodic System for Chemists
Table
12
24.30

Mg

Magnesium

Identification

CAS Number: 7439-95-4
Discovery Year: 1808
Discoverer: Sir Humphrey Davy
Discovery Location: England

Properties

Atomic Mass: 24.305 →Density: 1.74 g/cm³ →
Crust Abundance: 23300 mg/kg
Crystal Structure: HEX

Atomic Dimensions

Atomic Radius: 150 pm →
Atomic Radius (Rahm): 240 pm
Covalent Radius: 141 pm →
Van der Waals Radius: 173 pm
Metallic Radius: 136 pm
Atomic Volume: 14 cm³/mol
Lattice Constant: 3.21 Å

Thermodynamics

Melting Point: 922 K →Boiling Point: 1363 K →Specific Heat: 1.025 J/(g·K) →Thermal Conductivity: 156 W/(m·K) →Heat of Fusion: 9.2 kJ/mol →Heat of Vaporization: 131.8 kJ/mol →
Heat of Formation: 147.1 kJ/mol

Electronic Structure

Electron Config: [Ne] 3s2
Block: s
Period: 3 →Group: 2 →Electronegativity: 1.31 →
Oxidation States: +2

Abundance & Geochemistry

Crust Abundance: 23300 mg/kg
Sea Abundance: 1290 mg/L
Geochemical Class: major
Goldschmidt Class: litophile

About

Magnesium is a light, silvery-white metal. It is the eighth most abundant element in Earth's crust and is essential for plant and animal life.

Isotopes

Mg-24 24 78.88%
Mg-26 26 11.09%
Mg-25 25 10.03%