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Helium
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Helium is a lightweight gas and chemical element. Hydrogen is the only element that weighs less than helium. Helium is called an inert gas or noble gas. These terms are used ecause helium does not combine with ther elements.
Helium makes up only a small fraction of the earth's matter. But it is one of the most common elements in the universe. The sun and other stars are made mostly of helium and hydrogen. The energy of these stars is produced when hydrogen atoms fuse (join together) to form helium atoms. This process is also what gives the hydrogen bomb its energy. |
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