← Back to periodic table
Strontium (Sr)
Atomic number: 38 · Category: alkaline earth metal · Group 2 · Period 5 · Phase: Solid
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.
Block: s
Molar heat: 26.4
CPK color:#00ff00
Electronic structure
Electron configuration: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2
Configuration (semantic): [Kr] 5s2
Shells: 2, 8, 18, 8, 2
Electronegativity (Pauling): 0.95
Electron affinity: 5.023
Ionization energies: 549.5, 1064.2, 4138, 5500, 6910, 8760, 10230, 11800, 15600, 17100, 31270
Periodic position
Group: 2
Period: 5
xpos: 2
ypos: 5
Spectral/Bohr images
Image
3D Model