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| any of a number of polymers containing alternate silicon and oxygen atoms and that are fluid, resinous, rubbery, extremely stable in high temperatures, and water-repellent |
| having an unsymmetrical arrangement of atoms in a molecule, or noting a carbon atom bonded to four different atoms or groups |
| alkaline-earth metal
Any of a group of metallic elements that includes beryllium, magnesium, calcium, strontium, barium, and radium. Because the alkaline-earth metals have two electrons in their outer shell, they react easily with other elements and are found in nature only in compounds. See Periodic Table. |