Periodic Table
38
Sr
87.62
Strontium
Alkaline EarthCrimson-red flame (fireworks); SrCO₃, SrSO₄.
Electronic Configuration
[Kr] 5s²or1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s²
Electron shells
2e⁻n=1
8e⁻n=2
18e⁻n=3
8e⁻n=4
2e⁻n=5
Properties
Atomic number
38
Atomic mass
87.62 u
Category
Alkaline Earth
Block / Group / Period
s · 2 · 5
Valence electrons
2
Oxidation states
+2
Electronegativity
0.95
Atomic radius
219 pm
Ionization energy
549 kJ/mol
Electron affinity
5 kJ/mol
Melting point
1050 K / 777 °C
Boiling point
1655 K / 1382 °C
Density
2.64 g/cm³
State at 25 °C
solid
Personal Notes
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