Atoms that have lost or gained electrons are ions. Ions have the electronic structure of a Noble Gas (Group 0 - Helium, Neon, Argon, Krypton, Xenon, Radon)
The elements that most readily form ions are those in Groups 1, 2, 6, and 7. Group 1 and 2 elements are metals, and they lose electrons to form positive ions. Groups 6 and 7 elements are Non-metals, and they gain electrons to form negative ions
For example:
- Group 1 elements (Alkali metals) form ionic compounds with non-metals where the metal ion has a charge of +1 (Group 7 elements or 'Halogens') E.g K+Cl- (Potassium Chloride)
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