Nat Turner led a slave revolt several years before the Civil War. The revolt failed and he was killed. he is known for leading 2 uprises in Virginia in 1831 before getting caught.
Calcium (Ca), chemical element, one of the alkaline-earth metals of Group 2 (IIa) of the periodic table. It is the most abundant metallic element in the human body and the fifth most abundant element in Earthâs crust.
Calcium. The chemical element Calcium (Ca), atomic number 20, is the fifth element and the third most abundant metal in the earthâs crust. The metal is trimorphic, harder than sodium, but softer than aluminium.