<prompt> Erethism occur inHgAsPbCu  <response>: Ans is a i.e. HgMercury Erethism: is a peculiar disturbance of the personality characterized by shyness irritability, tremors, loss of memory and insomnia.Other imp. Points about mercury :Most poisonous salt of mercury - Mercuric chlorideAcute poisoning causes nephrotoxicity Chronic poisoninga blue-black line on the gums as with lead poisoningMercuria lentisis a peculiar eye change due to brownish deposits of mercury in the lens. It is bilateral and has no effect on visual acuity.Tremors are seen and are ka Hotters shake or glass blowers shakeErethism is seenAcrodynia is seen. 