PERIODIC ELEMENT
Y (Yttrium )

 



Atomic number : 39
Atomic mass : 88.9059 g.mol-1
Electronegativity according to Pauling : 1.2
Density : 4.47 g.cm-3 at 20 °C
Melting point : 1500 °C
Boiling point : 3336 °C
Vanderwaals radius : 0.106 nm
Isotopes : 10
Electronic shell : [kr] 4d1 5s2
Energy of first ionisation : 626 kJ.mol-1
Energy of second ionisation : 1185 kJ.mol-1
Energy of third ionisation : 1980 kJ.mol-1
Discovered by : Johann Gadolin in 1794
 
Atomic Structure Uses (color TV's, radars)