Metals and nonmetals make up almost everything in our world. They represent the two biggest sections on the periodic table of elements. But what exactly makes a metal? How are nonmetals similar? And what's a metalloid? Learn the answers to these questions and more.

All around -- A place on the table -- What makes it metal? -- Making from metals -- When it's not metal -- Know your nonmetals -- Important elements -- Crossing the line -- Under our feet -- Metals, nonmetals, and metalloids.