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What does octet rule mean?

Looking for the meaning or definition of the word octet rule? Here's what it means.

Noun
  1. (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.)
  2. (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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Examples
It is possible to write Lewis structures that do satisfy the octet rule.
The stabilities of organometallic compounds follow certain empirical rules, among which the 18-electron rule is the analogue of the octet rule of main-group compounds.
An atom will bond with another in order to satisfy the octet rule.
Often the atoms comprising a complex molecule can be arranged in several ways and still satisfy the octet rule for each atom.
Hypervalent compounds are very common and in general are no less stable than compounds that conform to the octet rule.
Lewis' octet rule is again applicable and is seen to represent the extreme means of achieving lower energy rather than being a goal in itself.

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