Name the metals and non-metals present in abundance on the earth's crust.
(a) Name the three classes in which elements are classified. Which was the first metal used by man?
(b) Name the metal and non-metal present in abundance in the earth crust.
(a) Name the most abundant metal in the earth's crust (b) Name the most abundant non-metal in hte earth's crust.
Name one each: The most abundant metal and non-metal in the earth's crust.