CHEM1006 Lecture Notes - Lecture 17: Octet Rule, Ionic Bonding, Ionic Compound

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1 Aug 2016
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Lecture 17
Ionic bonds are a class of chemical bonds that result from
the exchange of one or more valence electrons from one
atom, typically a metal, to another, typically a nonmetal.
This electron exchange results in an electrostatic
attraction between the two atoms called an ionic bond.
An atom that loses one or more valence electrons to
become a positively charged ion is known as a cation,
while an atom that gains electrons and becomes
negatively charged is known as an anion.
This exchange of valence electrons allows ions to achieve
electron configurations that mimic those of the noble
gases, satisfying the octet rule.
The octet rule states that an atom is most stable when
there are eight electrons in its valence shell.
Atoms with less than eight electrons tend to satisfy the
duet rule, having two electrons in their valence shell.
By satisfying the duet rule or the octet rule, ions are
more stable.
A cation is indicated by a positive superscript charge to
the right of the atom.
An anion is indicated by a negative superscript charge to
the right of the atom.
If a sodium atom loses one electron, it will have one
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