An element is a chemical substance made up of a particular kind of atom and hence cannot be broken down or transformed by a chemical reaction into a different element, though it can be transmuted into another element through a nuclear reaction.
Almost 40 years separate Shirley Ann Jackson's achievement, as the first African-American woman to earn a Ph.D. in theoretical high energy physics at Massachusetts Institute of Technology, and Jedidah Isler, the first African-American woman to receive a Ph.D. in Astrophysics from Yale.
In 1987, Toni Morrison was named the Robert F. Goheen Professor in the Council of Humanities at Princeton University. She became the first black woman writer to hold a named chair at an Ivy League University. While accepting, Morrison said, I take teaching as seriously as I do my writing..