Ionic Compounds An ionic bond holds positive ion(s) and negative ion(s) together to form compounds [ Click Here for an Ionic Bond Animation

Ionic Compounds Most are compounds that contain a metal and a non-metal. Ex: NaCl

Ionic Compounds Most form crystal structures. Can be very brittle and will break or shatter on contact. [

Ionic Compounds Most have high melting points. (Very Strong Bonds!) Most will dissolve easily in water Will conduct electricity when liquid or dissolved in H 2 O

Ionic Compound Formulas Chemical Formulas show how many atoms of a particular element are present in a compound Example: Al 2 O 3 2 Aluminum atoms & 3 Oxygen atoms

Ionic Compound Formulas Ionic formulas are determined by the positive and negative charges of the atoms.

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Ionic Compound Formulas Example: Magnesium Chloride Mg +2 and Cl -1 You need 2 Cl -1 to neutralize the Mg +2 MgCl 2 [

Ionic Compound Formulas Use the “Criss-Cross” method to write formulas Ex: Sodium Sulfide Na +1 S -2 NaS 2

Ionic Compound Formulas Ex: Magnesium Oxide Mg +2 and O -2 “Criss-Cross” gets Mg 2 O 2 But only 1 atom of each is needed to neutralize so MgO is correct!

Ionic Compound Names 1 st - Write the name of the metallic element. 2 nd – Then write the name of the non-metallic element with the suffix –ide.

Ionic Compound Names Example: MgBr 2 Magnesium Bromide Example: Al 2 O 3 Aluminum Oxide

Transition Metal Ions Transition metals do not have an ion pattern and can have more than one type of charge. [

Transition Metal Ions Example: FeO What is the charge of Fe? We know O -2 … Fe must be +2 to neutralize the –2 of Oxygen... Iron (II) Oxide

Transition Metal Ions Example: Cu 2 O Copper (I) Oxide

Polyatomic Ions Ions that are made of multiple atoms. Example: OH - is the hydroxide ion. Pg. 232

Polyatomic Ions When naming, use the exact name of the ion. Example: NaNO 3 This is sodium nitrate.

Polyatomic Ions Example: Magnesium Hydroxide Mg +2 and OH - Mg OH 2 ( )