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Uranium

in a few cases) three-letter symbol that represents the element. Most likely to be found: solid, liquid, or gas—based on its location. The pe- riodic table is a very useful tool as one begins to investigate chemistry and science in general. This book is about the element uranium. Uranium, the heaviest nat- ural element on Earth, has 92 protons and 92 electrons. The most abun- dant isotope of uranium has 146 neutrons. Uranium is a silvery-white

Uranium’s nucleus is surrounded by a large cluster of 92 electrons arranged in seven orbital rings.

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