All Atoms want noble gas stability “ they want their valence s & p orbitals to be full!!! ” What is the easiest way for sodium to get 8 valence? Octet Rule – atoms tend to _____, _____ or _______ until they have 8 valence electrons What is the easiest way for chlorine to get 8 valence? losegain share Pg Na:1s 2 2s 2 2p 6 3s 1 Cl: 1s 2 2s 2 2p 6 3s 2 3p 5

Cation: “+” (positively) charged ion Pg Anion: “-” (negatively) charged ion

Ionic Bonding electron transfer from one atom to another to create noble gas stable ions oppositely charged ions attract Pg 56-57;

Ionic Bonding the electrical attraction that “glues” (keeps the ions together) is called “ionic bond” Pg 56-57; Linked

Formula Writing when writing chemical formulas –positive cation is written first –negative anion is written second –total charge of cation must equal total charge of anion “NaCl” LinkEd

How/what compound forms when Ca bonds with Cl ??? 1.write Lewis dot diagram for Ca 2.write Lewis dot diagram for Cl 3.How must electrons transfer to create noble gas stability Write the formula for this compound. CaCl 2 Linked

How/what compound forms when Mg bonds with N ??? 1.Write Lewis Symbol for Mg 2.Write Lewis Symbol for N 3.How must electrons transfer to create noble gas stability Write the formula for the new compound. LinkEd Magnesium nitride was the catalyst in the first practical synthesis of borazon (cubic boron nitride). CBN is used as a blade sharpener instead of diamond.catalyst borazonboron nitride

ions bond together to make a new/ different compound… so…what do we call the new compound? You’re gonna call me WHAT???

Naming Monoatomic Ions Cations –named for parent element followed by “ion” –Na +  “sodium ion” –K +  ??? “potassium ion” Anions –named for parent element BUT drop the ending and add “ide” –Br -  bromine becomes  “bromide ion” –S -2  ??? –Oxygen  ??? “sulfide ion” “oxide ion”

Transition Metal Ions can have more than one charge (Fe +2 or Fe +3 )… so how do you know which is in a compound? Latin System – if only two possible charges, use: –suffix “ous” to designate lower charge –suffix “ic” to designate higher charge –Fe +2  ferrous ion –Fe +3  ferric ion Stock System – use Roman numerals to designate charge –Pb +2  lead (II) ion –Pb +4  lead (IV) ion

Naming Binary Ionic Compounds Write cation first followed by anion KI  “potassium iodide” if cation can have multiple charges; designate specific charge using either the Stock or Latin System PbO 2  ???

Practice – write the formula and name for the compound that forms when the following bond strontium and bromine sodium and phosphorous iron (II) ion and oxygen

Polyatomic Ions two or more atoms bound together predominantly by covalently bonds they form a stable group that carries a charge (NH 4 ) + “ammonium ion” (OH) - “hydroxide ion”

Practice – write the formula and name for the compound that forms when the following bond strontium and hydroxide sodium and phosphate iron (II) and sulfate