2. Non-metals, such as oxygen, phosphorus, and sulfur (a) do not have a metallic luster, and (b) are generally poor conductors of heat and electricity. Non-metals cannot be drawn into wire or hammered into sheets.
Some elements, called , such as arsenic, silicon and antimony, have some properties characteristic of metals and
non-metals.
Many familiar items such as glass, ice cream, wood and milk are not simple substances since they are not composed of one pure substance. These materials are called mixtures. A
results from the physical combination or union of two or more substances (elements or compounds) in no definite pro-portion by weight. Air, alloys, and solutions such as sugar or salt in water, are mixtures.
