Tetanus. 1  Tetanus, commonly called lockjaw, is caused by a bacterium that is mostly present in soil, manure, and in the digestive tracts of animals and humans. 2  Tetanus is not contagious and cannot be transmitted from person to person. Tetanus, commonly called lockjaw, is caused by a bacterium that is mostly present in soil, manure, and in the digestive tracts of animals and humans.
Sources of Lead. A child's environment is full of lead. Children are exposed to lead from different sources (such as paint, gasoline, solder, and consumer products) and through different pathways (such as air, food, water, dust, and soil). Although there are several exposure sources, lead-based paint is the most widespread and dangerous high-dose source of lead exposure for young children. Sources of Lead Artificial Turf
The symbol came from the Latin word plumbum, meaning lead: Date and Place of Discovery: Known to the ancients: Discovered by: Unknown: Common Compounds: Lead azide [Pb(N 3) 2] Lead chloride (PbCl 2) Lead chromate (PbCrO 4) Lead hydrogen arsenate (PbHAsO 4) Lead iodide (PbI 2) Lead nitrate [Pb(NO 3) 2] Lead oxide (PbO 2) Lead selenide (PbSe) Lead sulfate (PbSO 4) Lead sulfide (PbS) Lead telluride (PbTe) Interesting facts: It does not occur in nature in large amounts. It is usually found in zinc, silver and copper ores. Galena contains about 86.6% of lead. The greatest source of lead today is in recycling automobile batteries. It is a soft, heavy, toxic metal that is malleable. It is bluish white when cut but as it is exposed to the air it turns a dull gray. It has the highest atomic number of all the stable elements. It is a neurotoxin that accumulates in soft tissues and bone. It is not a good conductor of electricity.