Strontium - Sr

Symbol: Sr
Atomic Number: 38
Atomic Weight: 87.62
Element Classification: Alkaline-earth Metal
Discovered By: A. Crawford
Discovery Date: 1790 (Scotland)
Name Origin: The Scottish town, Strontian.

Density (g/cc): 2.54
Melting Point (°K): 1042
Boiling Point (°K): 1657
Appearance: Silvery, malleable metal
Atomic Radius (pm): 215
Atomic Volume (cc/mol): 33.7
Covalent Radius (pm): 191
Ionic Radius: 112 (+2e)
Specific Heat (@20°C J/g mol): 0.301
Fusion Heat (kJ/mol): 9.20
Evaporation Heat (kJ/mol): 144
Thermal Conductivity (@25°C W/m K):
Debye Temperature (°K): n/a
Pauling Negativity Number: 0.95
First Ionizing Energy (kJ/mol): 549.0
Oxidation States: 2
Electronic Configuration: [Kr] 5s2
Lattice Structure: Face-Centered Cubic (FCC)
Lattice Constant (Å): 6.080
Lattice C/A Ratio: n/a

Mineral Hardness [no units]: 1.5

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