lead (Pb), n a common soft, blue-gray, metallic element. Its atomic number is 82, and its atomic weight is 207. In its metallic form, it is used as a protective shielding against radiographs.ead. A metallic element, atomic no. 82, atomic wt. 207.2; occurs in nature as an oxide or one of the salts, but chiefly as the sulfide, or galena; 210 Pb (half-life equal to 22.6 years) has been used in the treatment of certain eye conditions.
Republic, MO. Sponsored Topics. Republic is a city in Christian and Greene counties in the U.S. state of Missouri. The population was 8,438 at the 2000 census, and 14,300 as of 2009. It is part of the Springfield, Missouri, Metropolitan Statistical Area.
Sullivan County, Missouri. Not to be confused with Sullivan, Missouri. Sullivan County is a county located in the northern portion of the U.S. state of Missouri. As of the 2010 census, the population was 6,714. Its county seat is Milan. The county was organized February 14, 1845 and named for Major General John Sullivan of the American Revolutionary War.