Presentation is loading. Please wait.

Presentation is loading. Please wait.

Ionic Compound Formulas

Similar presentations


Presentation on theme: "Ionic Compound Formulas"— Presentation transcript:

1 Ionic Compound Formulas

2 Ions Cation: A positive ion Mg2+, NH4+ Anion: A negative ion
Cl-, SO42-

3 Predicting Ionic Charges
Group 1: Lose 1 electron to form 1+ ions H+ Li+ Na+ K+

4 Predicting Ionic Charges
Group 2: Loses 2 electrons to form 2+ ions Be2+ Mg2+ Ca2+ Sr2+ Ba2+

5 Predicting Ionic Charges
Loses 3 electrons to form 3+ ions Group 13: B3+ Al3+ Ga3+

6 Predicting Ionic Charges
Lose 4 electrons or gain 4 electrons? Group 14: Neither! Group 13 elements rarely form ions.

7 Predicting Ionic Charges
Nitride Gains 3 electrons to form 3- ions Group 15: Phosphide P3- As3- Arsenide

8 Predicting Ionic Charges
Oxide Gains 2 electrons to form 2- ions Group 16: S2- Sulfide Se2- Selenide

9 Predicting Ionic Charges
Group 17: Gains 1 electron to form 1- ions F1- Fluoride Cl1- Chloride Br1- Bromide I1- Iodide

10 Predicting Ionic Charges
Group 18: Stable Noble gases do not form ions!

11 Predicting Ionic Charges
Many transition elements have more than one possible oxidation state. Groups : Iron(II) = Fe2+ Iron(III) = Fe3+

12 Predicting Ionic Charges
Some transition elements have only one possible oxidation state. Groups : Zinc = Zn2+ Silver = Ag+

13 Writing Ionic Compound Formulas
Example: Barium nitrate 1. Write the formulas for the cation and anion, including CHARGES! 2. Check to see if charges are balanced. 3. Balance charges , if necessary, using subscripts. Use parentheses if you need more than one of a polyatomic ion. Ba2+ NO3-1 Ba(NO3)2 Not balanced!

14 Writing Ionic Compound Formulas
Example: Ammonium sulfate 1. Write the formulas for the cation and anion, including CHARGES! 2. Check to see if charges are balanced. 3. Balance charges , if necessary, using subscripts. Use parentheses if you need more than one of a polyatomic ion. NH4+1 SO42- (NH4)2SO4 Not balanced!

15 Writing Ionic Compound Formulas
Example: Iron(III) chloride 1. Write the formulas for the cation and anion, including CHARGES! 2. Check to see if charges are balanced. 3. Balance charges , if necessary, using subscripts. Use parentheses if you need more than one of a polyatomic ion. Fe3+ Cl- FeCl3 Not balanced!

16 Writing Ionic Compound Formulas
Example: Aluminum sulfide 1. Write the formulas for the cation and anion, including CHARGES! 2. Check to see if charges are balanced. 3. Balance charges , if necessary, using subscripts. Use parentheses if you need more than one of a polyatomic ion. Al3+ S2- Al2S3 Not balanced!

17 Writing Ionic Compound Formulas
Example: Magnesium carbonate 1. Write the formulas for the cation and anion, including CHARGES! 2. Check to see if charges are balanced. Mg2+ CO32- Mg(CO3) They are balanced!

18 Writing Ionic Compound Formulas
Example: Zinc hydroxide 1. Write the formulas for the cation and anion, including CHARGES! 2. Check to see if charges are balanced. 3. Balance charges , if necessary, using subscripts. Use parentheses if you need more than one of a polyatomic ion. ( ) Zn2+ OH- Zn(OH)2 Not balanced!

19 Writing Ionic Compound Formulas
Example: Aluminum phosphate 1. Write the formulas for the cation and anion, including CHARGES! 2. Check to see if charges are balanced. Al3+ PO43- AlPO4 They ARE balanced!

20 Naming Ionic Compounds
Cation first, then anion Monatomic cation = name of the element Ca2+ = calcium ion Monatomic anion = root + -ide Cl- = chloride CaCl2 = calcium chloride

21 Naming Ionic Compounds (continued)
Metals with multiple oxidation states some metal forms more than one cation use Roman numeral in name PbCl2 Pb2+ is cation PbCl2 = lead(II) chloride


Download ppt "Ionic Compound Formulas"

Similar presentations


Ads by Google