Mr. Gardner 7th Srade Science

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Presentation transcript:

Mr. Gardner 7th Srade Science Section 3: Ionic Bonds Mr. Gardner 7th Srade Science

Key Concepts What are ions, and how do they form bonds? How are the formulas and names of ionic compounds written? What are the properties of ionic compounds?

Key Terms Ionic Polyatomic Ionic compounds Chemical formula Subscript Crystal

Ions and Ionic Bonds Almost every atom feels better when they have 8 electrons in their valence shell. Ions: A group of atoms that have an electric charge. Either positive or negative When an atom looses an electron it becomes positive When an atom gains an atom Polyatomic Ions Ions made of more than one atom.

Ionic Bonds

Chemical Formulas and Names Chemical Formula: A combination of symbols that shows the ration of elements in a compound.

Formulas of Ionic Compounds When ionic compounds form, the ions come together in a way that balances out the charges on the ions. The chemical formula for the compounds reflects this balance. Subscript: tells you the ration of elements in the compound.

Naming Ionic compounds The name of the positive ion comes first, followed by the name of the negative ion (usually). NaCl = Sodium Chloride MgCl2 = Magnesium Chloride Usually ends in ide Polyatomic ions are different: Usually ends in ate NH4NO3 = Ammonium Nitrate

Properties of Ionic Compounds Ionic Crystals Ions form an orderly, three dimensional arrangement called Crystals. High Melting points Electrical Conductivity