Of mercury with a valence of two; of mercury(II)
A brilliant red solid, HgI2, used as an antiseptic.
A red or yellow crystalline solid, HgO, used as a chemical reagent and in battery electrodes.
A toxic white crystalline compound, used as a fungicide and antiseptic
A black or bright red crystalline solid, HgS, used chiefly as a pigment in paints, plastics, and rubber.