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.
Joseph Mary Plunkett. Joseph Mary Plunkett was born in 1887 in Dublin. He was the son of a papal count and was educated in England and Ireland. He had poor health but despite this he helped to establish an Irish national theatre. Joseph Plunkett joined the Irish Volunteers in 1913, and later became a member of the Irish Republican Brotherhood.