PERIODIC ELEMENT
Sr (Strontium)

 



Atomic number : 38
Atomic mass : 87.62 g.mol-1
Electronegativity according to Pauling : 1.0
Density : 2.6 g.cm-3 at 20 °C
Melting point : 769 °C
Boiling point : 1384 °C
Vanderwaals radius : 0.215 nm
Ionic radius : 0.113 nm (+2)
Isotopes : 14
Electronic shell : [Kr] 5s2
Energy of first ionisation : 549.2 KJ.mol-1
Energy of second ionisation : 1064 KJ.mol-1
Discovered by : A. Crawford in 1790
 
Atomic Structure Uses (flares, fireworks, crimson color)