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.
The element lead has 82 protons and 82 electrons. It's element number 82 and has a molar mass of 207 moles/gram. Leadâs atomic symbol is Pb. Lead is in group 14 in the carbon group on the periodic table. It's a soft and malleable heavy metal that's naturally gray in color. Lead has many uses and is most often found in building construction sites, lead batteries, bullets, weights and radiation shields. Lead should never be ingested by humans or animals for fear of lead poisoning.