Tl

THALLIUM

Definition from 'thalos' or green shoot. has a high index of refraction which is very important in the manufacture of optical glasses.

Discovery 1861 sir william crookes of britain

Uses imitation of diamonds, glasses

Group of Elements Basic metals(Solid)

Atomic Weight 204.382; 204.385

Oxidation State +1,3

Melting Point 303.5

Boiling Point 1457

Density 11.85 g/cm3

Electronegativity 1.8