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38Sr87.62
Strontium
Alkaline earth metalsBlock sPeriod 5Group 2solid at 20 °C
Configuration :[Kr] 5s²
Atomic mass :87.62 u
3D Bohr-model representation of the Strontium atom (symbol Sr, atomic number Z=38). Electron shell configuration: 2, 8, 18, 8, 2 electrons.
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Bohr model · educational
Electron configuration
Full[Kr] 5s²
Short[Kr] 5s²
Valence electrons2
KLMNOPQ shells
K2
L8
M18
N8
O2
Electronegativity
Pauling0.95
Allen0.963
Mulliken (eV)—
Atomic radii
Empirical200 pm
Calculated219 pm
Covalent195 pm
Van der Waals249 pm
Ionic radii (Shannon-Prewitt)
+2118 pm
Successive ionisation energies
I₁549.5 kJ/mol
I₂1064.2 kJ/mol
I₃4138 kJ/mol
I₄5500 kJ/mol
I₅6910 kJ/mol
Electron affinity5.03 kJ/mol
Oxidation states
+1+2
Bold states = most common.