Invar
An iron alloy containing 35-36% Ni, 0.5% C, and 0.5% Mn which has zero co-efficient of thermal expansion up to 2050C.
Iodic acid
Refers to any of various oxoacids of iodine, such as iodic (V) acid and iodic (VII) acid. When used without an oxidation state specified, the term usually refers to iodic (V) acid (HO3).
Iodide
A compound of iodine with another element or radical.
Iodine monochloride (ICI)
A dark red liquid which is obtained by passing chlorine over iodine. It has properties similar to those of its constituent halogens, iodine monochloride is used as a nonaqueous solvent and as an iodating agent in organic reactions.


