The Structure of Matter Atoms and Molecules

Molecules Atoms of the same element or of different elements combine with each other into more complicated systems called molecules molecules are the smallest units of chemical compounds, the basic components of the countless inorganic and organic compounds. A few molecules, such as, those of the chemical elements hydrogen, oxygen, and nitrogen, are com- 

TABLE 3 Composition, Properties, and Ancients Uses of Common Minerais and Mineraioids 

Common name Composition Color Density (g/cm ) Hardness (Mohs scale) Structure Main uses 

Alabaster Calcium sulfate Various colors 2.3 1.8 Crystalline Lapidary 

Alabaster Calcium carbonate Various colors 2.5 2.8 Crystalline Lapidary 

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