38 - Strontium alkaline earth metal

Discovered by William Cruickshank in 1808

  • Atomic Radius (Å)
  • Cividis
Strontium

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.

H He Li Be B C N O F Ne Na Mg Al Si P S Cl Ar K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe Cs Ba La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn Fr Ra Ac Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr Rf Db Sg Bh Hs Mt Ds Rg Cn Nh Fl Mc Lv Ts Og
57-71 La-Lu Lanthanides
89-103 Ac-Lr Actinides
 Shell Electrons Orbitals
122 in 1s
282 in 2s + 6 in 2p
3182 in 3s + 6 in 3p + 10 in 3d
482 in 4s + 6 in 4p
522 in 5s
StrontiumSrElectron 1Electron 2Electron 1Electron 2Electron 3Electron 4Electron 5Electron 6Electron 7Electron 8Electron 1Electron 2Electron 3Electron 4Electron 5Electron 6Electron 7Electron 8Electron 9Electron 10Electron 11Electron 12Electron 13Electron 14Electron 15Electron 16Electron 17Electron 18Electron 1Electron 2Electron 3Electron 4Electron 5Electron 6Electron 7Electron 8Electron 1Electron 2
87.6  u Atomic Mass
2  Å Atomic Radius
1.66k  K Boiling Point
2 Group
2 Common Oxidation States
1.95  Å Covalent Radius
2.64  g/cm³ Density
5.02  kJ/mol Electron Affinity
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 Electron Configuration
[Kr] 5s2 Electron Configuration (semantic)
0.95 Electronegativity
38 Electrons
5.69  eV First Ionization Energy
2 ICSD Oxidation States
549.5, 1064.2, 4138, 5500, 6910, 8760, 10230, 11800, 15600, 17100, 31270  kJ/mol Ionization Energies
1.04k  K Melting Point
15 Mendeleev Number
26.4  J/(mol·K) Molar Heat
5 Number of Shells
2 Electron Valency
50 Neutrons
38 Atomic Number
18 Number of Isotopes
2 Oxidation States
5 Period
Solid Phase
38 Protons
2, 8, 18, 8, 2 Electron Shell Occupations