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| P2 |
symbol of the chemical element phosphorus. |
| Pb |
symbol of the chemical element lead. |
| phosphorus |
a substance that is a chemical element. One of the common forms of phosphorus is a poisonous yellow solid that glows in moist air. Phosphorus is important to living things. It is used in fertilizers to help plants grow. (symbol: P) |
| pixel |
one of the tiny dots of light that make up an image on a computer or television screen. A pixel is the smallest unit of a video image. The word "pixel" is a shortened form of the phrase "picture element". |
| plutonium |
a radioactive chemical element. Plutonium is used to produce nuclear energy. (symbol: Pu) |
| Pu |
symbol of the chemical element plutonium. |
| Ra1 |
symbol of the chemical element radium. |
| Rn |
symbol of the chemical element radon. |
| Se |
symbol of the chemical element selenium. |
| silicon |
a hard, dark gray substance that is a chemical element. It is found in silica, a compound that makes up one fourth of the earth's crust. Silicon is used in making glass, concrete, bricks, and computer chips. (symbol: Si) |
| Sn |
symbol of the chemical element tin. |
| sodium |
a soft, silver-white metal that is a chemical element. It combines easily with other elements and is found in nature only in compounds with other elements. Sodium reacts with chlorine to form the salt we eat in foods. (symbol: Na) |
| Ti |
symbol of the chemical element titanium. |
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