Basics:
Positive and negative ions form during some reactions. Ionic compounds are usually formed when metals react with non-metals.
The ions formed are held to each other by enormously strong forces of attraction between the oppositely charged ions.
Key Points:
1. Ionic compounds are held together by strong forces between the oppositely charged ions.
2. Other elements that can form ionic compounds include those in Group 2 and 6.
Common salt in sodium chloride. In just 58.5g of salt there are over 600 000 000 000 000 000 000 000 ions of Na+ and the same number of Cl- ions.
The structure of ionic lattice is investigated by passing X-rays through them.
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