#38
Strontium
alkaline earth metal· Solid·87.621 u
Strontium is a chemical element with symbol Sr and atomic number 38. An alkaline earth metal, strontium is a soft silver-white or yellowish metallic element that is highly reactive chemically. The metal turns yellow when it is exposed to air.
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Identity
- Symbol
- Sr
- Atomic Number
- 38
- Atomic Mass
- 87.621 u
- Category
- alkaline earth metal
- Block
- s-block
- Period
- 5
- Group
- 2
- Appearance
- Chemical element with atomic number 38 (Sr)
- Year Discovered
- 1790 CE
- Discovered By
- William Cruickshank (chemist)
- Named By
- Strontian
Electrons
- Configuration
- [Kr] 5s2
- Full Configuration
- 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2
- Shells
- 2, 8, 18, 8, 2
- Electronegativity
- 0.95
- Electron Affinity
- 5.023
- Oxidation States
- +2
- Ionization Energies
- 549.5, 1064.2, 4138, 5500, 6910 … +6 more
Physical Properties
- State at
- Solid
- Melting Point
- 1050
- Boiling Point
- 1650
- Density
- 2.64
- Molar Heat
- 26.4 J/(mol·K)
- Crystal Structure
- FCC
- Magnetic Ordering
- Paramagnetic
Mechanical
- Atomic Radius
- 219 pm
- Covalent Radius
- 195 pm
- Van der Waals
- 249 pm
- Metallic Radius
- 215 pm
- Mohs Hardness
- 1.5
- Brinell Hardness
- 370 MPa MPa
- Bulk Modulus
- 12 GPa GPa
- Shear Modulus
- 6.1 GPa GPa
- Young's Modulus
- 15.7 GPa GPa
Thermal & Electrical
- Thermal Conductivity
- 35.4 W/(m K) W/(m·K)
- Electrical Conductivity
- 7.69 MS/m S/m
- Specific Heat
- 300 J/(kg K) J/(g·K)
- Heat of Vaporization
- 141 kJ/mol kJ/mol
- Heat of Fusion
- 7.43 kJ/mol kJ/mol
Abundance
- Universe
- 40.0 ppb
- Sun
- 50.0 ppb
- Meteorite
- 7.8 ppm
- Earth's Crust
- 370 ppm
- Ocean
- 7.9 ppm
- Human Body
- 4.6 ppm