UNDERSTANDING UNDERSTANDING CHEMICAL CHEMICAL REACTIONSREACTIONS

Ionic Bonding - continuedIonic Bonding - continued

Ionic bondingIonic bonding• Whenever a non-metal reacts with a

metal to form a new compound, ionic bonding is responsible.

• Compounds made from ionic bonds form GIANT STRUCTURES (not molecules)

Another example of ionic Another example of ionic bondingbonding

• Magnesium and chlorine

Another example of ionic Another example of ionic bondingbonding

To obtain full outer shells:• Mg atom must lose 2 electrons• Cl atom must gain 1 electron.• So when Mg reacts with Cl, each Mg

atom reacts with two chlorine atoms, to form magnesium chloride.

• The ions form a giant ionic structure.

• There are two chloride ions for each magnesium ion.

• The formula for magnesium chloride is MgCl2

• The compound has no overall charge.

Some other ionsSome other ions• Not every element forms ions during

reactions.• Out of the first twenty elements in

the Periodic Table, only eleven easily form ions.