• Disodium phosphate

• Sodium chloride

1. Guess the chemical formula for these compounds

2. Are they the same type of compound?

3. Are there any similarities or differences in the names of these compounds?

Naming! Ionic Compounds

(Going from Formula Unit to its name)

Monatomic Ions

– Consist of a single atom with a positive or negative charge.

Naming Cations

• Metals belonging to groups 1A and 2A keep their name

Name: Sodium ion

Cations

• Positively charged ions. – Always followed by the word ion or cation.

• Ex. Sodium ion or Sodium cation• Calcium ion• Aluminum ion

Practice Monatomic Cation

• Name:– Li

Lithium Ion– Be

Beryllium Ion

Anions

• These are negative charged ions.– Naming starts with the stem of the element

and then ends in an –ide. • Ex. Sulfide ion or Chloride ion or nitride ion

• Sulf -ide

Practice Monatomic anion

• Name:– Cl

Chloride– Nitrogen

Nitride

Binary Compounds

• A compound composed of two elements.– Ionic compound is metal + nonmetal

– Ex. Potassium chloride • K+ and a Cl- Chemical formula of KCl

– Calcium bromide • Ca2+ and Br- Chemical formula is CaBr2

Binary Compounds:

• LiCl

Lithium chloride

• BeO

Beryllium oxide

Fe Fe

Iron (II) Iron (III)

Naming Transition Metals

• D-block elements

• Form more than one ion with different charges

• Place Roman numeral in parentheses after the name of the element to indicate charge.

– Ex: Fe name: Iron (II)

Fe name: Iron (III)

+2

+3

Practice with Transition Metals

• Try– Fe3 N2

Iron (II) Nitride

– CuCl 3

Copper (III) Chloride

Transition metals

• FeCl3

• Iron (III) chloride

• SnF2

• Tin (II) fluoride

What’s wrong with these names?

• K2O Potassium (II) Oxide » No (II) needed » Oxide should be lower case (oxide)

• CaCl2 Calcium dichlorine » Do not need prefix» chlorine should be chloride

Polyatomic Ions

• Group of atoms that behaves as a unit and has a positive or negative charge

Naming Polyatomic Ions

• Name cation + name of anion– Ex: Ca(CO3) = Calcium carbonate

• If there are two or more of a polyatomic ion, use a prefix.– Ex: Zn3(PO4)2 = Zinc diphosphate

Prefixes for Polyatomic Ions

Practice

• LiOH

• Mg(H30)2

Which part of the compound is a polyatomic ion?

Group of nonmetals following a metal= polyatomic ion

Practice Naming Polyatomic Ions

• NaHCO3

• Sodium bicarbonate