| F2 |
symbol of the chemical element fluorine. |
| Fe |
symbol of the chemical element iron. |
| fluorine |
a substance that is a chemical element. Fluorine combines easily with other elements to form compounds. Some of these compounds are used to prevent tooth decay. Fluorine is poisonous in its pure gas form. (symbol: F) |
| He |
symbol of the chemical element helium. |
| Hg |
symbol of the chemical element mercury. |
| hydrogen |
a very light gas that burns easily and is one of the chemical elements. Hydrogen is the most abundant element in the universe. It combines with oxygen to make water, and it is found in all living things. Hydrogen combines with many substances and has many uses. (symbol: H) |
| I2 |
symbol of the chemical element iodine. |
| K3 |
symbol of the chemical element potassium. |
| Kr |
symbol of the chemical element krypton. |
| krypton |
a gas that is a chemical element. Krypton does not combine easily with other elements. (symbol: Kr) |
| magnesium |
a light, silver-white metal that is a chemical element. It burns brightly when heated and is used for making fireworks. (symbol: Mg) |
| metal |
any solid mineral element that exhibits certain characteristics such as the ability to conduct heat or electricity. Most metals may be shaped under heat or pressure. Iron, silver, copper, and gold are metals. |
| Mg |
symbol of the chemical element magnesium. |
| Mn |
symbol of the chemical element manganese. |
| N1 |
symbol of the chemical element nitrogen. |
| Na |
symbol of the chemical element sodium. |
| Ne |
symbol of the chemical element neon. |
| Ni |
symbol of the chemical element nickel. |
| O2 |
symbol of the chemical element oxygen. |
| P2 |
symbol of the chemical element phosphorus. |
| Pb |
symbol of the chemical element lead. |