1 paroxysmal Pertaining to or marked by paroxysm; caused by paroxysms or convulsions of nature. 2  paroxysmal Specifically In geology: Relating to or produced by a violent convulsion of nature.
Inorganic lead compounds are Group 2A - Probably carcinogenic to humans. American Conference for Governmental Industrial Hygienists (ACGIH): A3 - Confirmed animal carcinogen. Teratogenicity / Embryotoxicity: DEVELOPMENTAL HAZARD. May harm the unborn child. Known to cause: learning disabilities, effects on behaviour.
More commonly, it bondswith various elements such as oxygen, sulfur, andchlorine to form inorganic arsenic compoundsand with carbon and hydrogen to form organicarsenic compounds. The water-soluble trivalentand pentavalent oxidation states of inorganic ar-senic are the most toxic arsenic compounds.