Atomic Element Z = 38 • Alkaline Earth Metal
Strontium (Sr) — Atomic Data, Electron Shells & Reactions
Strontium (symbol Sr, atomic number 38) has a standard atomic weight of 87.62 u and ground-state configuration [Kr] 5s2.
Atomic Number (Z)
38
IUPAC Symbol
Sr
Standard Atomic Weight
87.62 g/mol
Period / Group / Block
5 / 2 / s-block
Condensed Electron Config
[Kr] 5s2
Full Subshell Config
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 5s2
Principal Shell Occupancy
[2, 8, 18, 8, 2]
Pauling Electronegativity
0.95
First Ionization Energy
549 kJ/mol
Covalent Radius
195 pm
Melting Point
1050 K (776.85 °C)
Boiling Point
1655 K (1381.85 °C)
Density
2.64 g/cm³
Oxidation States
+2
Sr (Z=38) — Valence shell highlighted in vermilion