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Unformatted text preview: number of the element in the periodic table (for representative elements only) Atoms often gain, lose, or share electrons to achieve the same number of electrons as the noble gas closest to them in the periodic table Because all noble gasses (except He) have filled s and p valence orbitals (8 electrons), many atoms undergoing reactions also end up with 8 valence electrons. This observation has led to the Octet Rule : Atoms tend to lose, gain, or share electrons until they are surrounded by 8 valence electrons Note: there are many exceptions to the octet rule (He and H, for example), but it provides a useful model for understanding the basis of chemical bonding....
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