38 - Strontium alkaline earth metal
Discovered by William Cruickshank in 1808
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 |
|---|---|---|
| 1 | 2 | 2 in 1s |
| 2 | 8 | 2 in 2s + 6 in 2p |
| 3 | 18 | 2 in 3s + 6 in 3p + 10 in 3d |
| 4 | 8 | 2 in 4s + 6 in 4p |
| 5 | 2 | 2 in 5s |
87.6 u Atomic Mass
2.5 Å Atomic Radius
1.66k K Boiling Point
1.95 Å Covalent Radius
2.64 g/cm³ Density
5.02 Electron Affinity
0.95 Electronegativity
5.69 eV First Ionization Energy
1.04k K Melting Point
5 Number of Shells
2 Electron Valency
38 Atomic Number
2, 8, 18, 8, 2 Electron Shell Occupations
0.301 J/(g K) Specific Heat