| Definitions | | octet rule |
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noun Octet Rule
- (chemistry) A rule stating that atoms lose, gain, or share electrons in order to have a full valence shell of 8 electrons. (Hydrogen is excluded because it can hold a maximum of 2 electrons in its valence shell.)
- (chemistry) The statement that when atoms combine to form molecules they generally each lose, gain, or share valence electrons until they attain or share eight; also called Lewis rule of eight
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