from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun An electron in an outer shell of an atom that can participate in forming chemical bonds with other atoms.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun chemistry any of the electrons in the
outermost shellof an atom; capable of forming bondswith other atoms
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun an electron in the outer shell of an atom which can combine with other atoms to form molecules
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