The document discusses the properties of metals and non-metals. It states that non-metals are brittle and break easily, unlike metals which are ductile. Non-metals also have low density, melting points, and are poor conductors of heat and electricity. An exception is graphite, which conducts electricity well despite being a non-metal. The document concludes by noting that non-metals form oxides when reacting with oxygen, such as carbon forming carbon dioxide when burnt in air.