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| atom | |
| Pronunciation: | a-tom |
| Definition : | The smallest part of an element that still has all properties of that element. Its nucleus consists of protons and neutrons, and is surrounded by orbiting electrons. |
| Facts: | The lightest element is hydrogen. It is also the most abundant element in the universe. Uranium is an important element for nuclear energy. |
| Picture: |  |
| References: | Los Alamos National Laboratory's Periodic Table of the Elements |