A very poisonous metallic element that has three allotropic forms; arsenic and arsenic compounds are used as herbicides and insecticides and various alloys; found in arsenopyrite and orpiment and realgar.
Veure'n mésA neuropsychiatric disorder whose major manifestation is an inability to interact socially; other features include poor verbal and motor skills, single mindedness, and social withdrawal.
Veure'n més