Although calcium is the fifth most abundant element in the earth's crust, it is never found free in nature since it easily forms compounds by reacting with oxygen and water. Metallic calcium was first isolated by Sir Humphry Davy in 1808 through the electrolysis of a mixture of lime (CaO) and mercuric oxide (HgO).lthough calcium is the fifth most abundant element in the earth's crust, it is never found free in nature since it easily forms compounds by reacting with oxygen and water. Metallic calcium was first isolated by Sir Humphry Davy in 1808 through the electrolysis of a mixture of lime (CaO) and mercuric oxide (HgO).
Jim Plunkett. Jim Plunkett (born December 5, 1947) is a former American football quarterback who played college football for Stanford University, where he won the Heisman Trophy, and professionally for three National Football League teams: the New England Patriots, San Francisco 49ers and Oakland/Los Angeles Raiders.
John Cornforth: Brilliant chemist was profoundly deaf. John Cornforth was awarded a Nobel prize in chemistry in 1975 and is still the only Australian to take the Nobel in chemistry. That year he was also named as joint Australian of the Year. Later hen was knighted and still later the recipient of a Centenary of Federation medal for his contribution to society.