Misc: what is the oxidation state of any element in its standard state?

Questions

Soyuz 18B is launched.?

B.C. 1st known prediction of a solar eclipse.?

St Gregory VII, pope (1073-85), dies (birth date unknown).?

Alfonso VI of Castile captured Toledo, Spain, and brought the Moorish center of science into Christian hands.?

Ralph Waldo Emerson US, essayist/philosopher, born.?