Periodic System for Chemists
Table
4
9.01

Be

Beryllium

Identification

CAS Number: 7440-41-7
Discovery Year: 1798
Discoverer: Fredrich Wöhler, A.A.Bussy
Discovery Location: Germany/France

Properties

Atomic Mass: 9.0121831 →Density: 1.85 g/cm³ →
Crust Abundance: 2.8 mg/kg
Crystal Structure: HEX

Atomic Dimensions

Atomic Radius: 105 pm →
Atomic Radius (Rahm): 219 pm
Covalent Radius: 96 pm →
Van der Waals Radius: 153 pm
Metallic Radius: 89 pm
Atomic Volume: 5 cm³/mol
Lattice Constant: 2.29 Å

Thermodynamics

Melting Point: 1551 K →Boiling Point: 3243 K →Specific Heat: 1.824 J/(g·K) →Thermal Conductivity: 201 W/(m·K) →Heat of Fusion: 12.21 kJ/mol →Heat of Vaporization: 309 kJ/mol →
Heat of Formation: 324 kJ/mol

Electronic Structure

Electron Config: [He] 2s2
Block: s
Period: 2 →Group: 2 →Electronegativity: 1.57 →Electron Affinity: -2.4 eV →
Oxidation States: +2

Abundance & Geochemistry

Crust Abundance: 2.8 mg/kg
Sea Abundance: 0.0000056 mg/L
Geochemical Class: alkaline earth metal
Goldschmidt Class: litophile

About

Beryllium is a steel-gray, strong, lightweight metal. It is used in aerospace applications, X-ray equipment, and as an alloying agent.

Isotopes

Be-9 9 100.00%