38
87.62
Sr
Strontium
Identification
CAS Number: 7440-24-6
Discovery Year: 1790
Discoverer: A. Crawford
Discovery Location: Scotland
Properties
Atomic Dimensions
Atomic Radius: 200 pm →
Atomic Radius (Rahm): 279 pm
Covalent Radius: 195 pm →Van der Waals Radius: 249.00000000000003 pm
Metallic Radius: 191 pm
Atomic Volume: 33.7 cm³/mol
Lattice Constant: 6.08 Å
Thermodynamics
Electronic Structure
Electron Config: [Kr] 5s2
Block: s
Period: 5 →Group: 2 →Electronegativity: 0.95 →Electron Affinity: 0.048 eV →Oxidation States: +2
Abundance & Geochemistry
Crust Abundance: 370 mg/kg
Sea Abundance: 7.9 mg/L
Geochemical Class: alkaline earth metal
Goldschmidt Class: litophile
About
Soft yellowish metallic element, belongs to group 2 of the periodic table. Highly reactive chemically. Sr-90 is present in radioactive fallout and has a half-life of 28 years. Discovered in 1798 by Klaproth and Hope, isolated in 1808 by Humphry Davy.
Isotopes
Sr-88 88 82.58%
Sr-86 86 9.86%
Sr-87 87 7.00%
Sr-84 84 0.5600%
