| The New Dictionary of Cultural Literacy, Third Edition. 2002. |
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| helium |
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| A chemical element, usually found in the form of a gas, in which two electrons are in orbit, and the nucleus consists of two protons and two neutrons. Its symbol is He. | 1 |
| ‡ Helium is the best known of the inert gases. | 2 |
| ‡ Because it is lighter than air, helium is used to fill balloons. | 3 |
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| | | The New Dictionary of Cultural Literacy, Third Edition. Edited by E.D. Hirsch, Jr., Joseph F. Kett, and James Trefil. Copyright © 2002 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved. |
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