Elementary combinations.

From: Word Ways | Date: November 1, 2004| Author: Francis, Darryl | Copyright information

In school and college, we learnt that chemical elements combine with each other to form new substances, compounds, in very well-defined ways, obeying certain scientific rules. For example, we learned that two atoms of hydrogen and one atom of oxygen combine to form a molecule of water, and that one atom of sulfur combines with four atoms of oxygen to form a sulphate radical with electrical charge -2. In chemistry these rules of combination were explained in terms of valence and bond...

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