Sr
Strontium
Z 38 87.62 g/molAlkaline Earth Metal
Nucleus
38 Protons
50 Neutrons
38 Electrons (2 Valence)
Shell distribution: K2 • L8 • M18 • N8 • O2 • P0 • Q0
Electron Configuration
Energy
7p
6d
5f
7s
6p
5d
4f
6s
5p
4d
5s
4p
3d
4s
3p
3s
2p
2s
1s
[Kr]5s2
Radii
Empirical
200 pm2 Å
Calculated
219 pm2.19 Å
Covalent
195±10 pm1.95±0.1 Å
van Der Waals
249 pm2.49 Å
Oxidation States
CommonRare
0
+1
+2
Crystal Structure
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Face-centered Cubic