CaS CALCIUM SULFIDE Metal (calcium), non-metal (sulfide) Calcium is group 2 so it has +2 charge Sulfide is group 6 so it has a -2 charge Ions are in a 1:1 ratio So the chemical formula is: CaS

KBr Potassium Bromide Metal (potassium) and non-metal (Bromide) Potassium is group 1 so it has +1 charge Bromide is group 7 so it has a -1 charge Ions are in a 1:1 ratio KBr

Fe2S3 Iron (III) Sulfide Metal (Iron) and a non-metal (sulfide) Using stock system iron has a +3 charge Sulfide is in group six has -2 charge The ions exist in a 2:3 ratio Fe2S3

MgI2 Magnesium Iodide Metal (magnesium) and non-metal (Iodide) Magnesium is in group two so it has +2 charge Iodide is in group seven so it has -1 charge The ions exist in 1:2 ration MgI2

LiF Lithium Fluoride Metal (lithium) and non-metal (Fluoride) Lithium is group 1 so it has +1 charge Fluoride is group 7 so it has a -1 charge Ions are in a 1:1 ratio LiF

FeCl3 Iron (III) Chloride Metal (Iron) and a non-metal (chloride) Using stock system iron has a +3 charge Chloride is in group seven has -1 charge The ions exist in a 1:3 ratio FeCl3

Zn3(PO4)2 Zinc Phosphate Metal (Zinc) and a polyatomic ion (Phosphate) Zinc is transition metal that only forms a +2 ion Phosphate is the polyatomic PO4-3 Ions exist in 3:2 ration Zn3(PO4)2 Note the use of parentheses around the phosphate, it is because you need two of the whole polyatomic ion

Ammonium Nitrate While this appears to be a molecule, as there are no metals, ammonium is the one polyatomic cation that you should know Ammonium NH4+ has a +1 charge Nitrate NO3- has a -1 charge Ions are in a 1:1 ratio NH4NO3

Al(OH)3 Aluminum Hydroxide This is a metal (aluminum) and the polyatomic ion hydroxide Aluminum is in group 3 and has a +3 charge Hydroxide OH- has a -1 charge Ion exist in a 1:1 ratio Al(OH)3 Note the use of parentheses around the hydroxide, it is because you need two the whole polyatomic ion

Cu(H3CCOO)2 Copper(II) acetate This is a metal (copper) and the polyatomic ion acetate Using the Stock System copper has a +2 charge The polyatomic ion acetate has a -1 charge The ions exist in 1:2 ration Cu(H3CCOO)2 Note the use of parentheses around the hydroxide, it is because you need two of the whole polyatomic ion Also of note the acetate ion often shows up written different way, you need to be able to handle this

PbSO4 Lead(II) Sulfate Metal (lead) and the polyatomic ion sulfate Using the Stock System lead has a +2 charge Sulfate SO4-2 has a -2 charge The ions exist in a 1:1 ratio PbSO4

Dihydrogen Sulfide Molecule convention because there are two non-metals There are 2H The is 1S, H2S

Ca3P2 Calcium Phosphide Metal (calcium) and non-metal (phosphide) Calcium is in group two so it has +2 charge Phosphide is in group five so it has -3 charge Ion exist in 3:2 ratio Ca3P2

Fe2O3 Iron(III) Oxide Metal (Iron) and a non-metal (oxide) Using stock system iron has a +3 charge Oxide is in group six so it has -2 charge The ions exist in a 2:3 ratio Fe2O3

(NH4)3PO4 Ammonium Phosphate While this appears to be a molecule, as there are no metals, ammonium is the one polyatomic cation that you should know. Ammonium NH4+ has a +1 charge Phosphate is the polyatomic PO4-3 Ion exist in 1:3 ratio (NH4)3PO4 Note the use of parentheses around the ammonium, it is because you need three of the whole polyatomic ion

Sodium Carbonate This is a metal (sodium) and the polyatomic ion carbonate Sodium is group 1 so it has +1 charge Carbonate CO3-2 has a -2 charge Ions exist in a 2:1 ratio Na2CO3

Tetrahydrogen DiNitride Two non-metals so we use molecule naming convention Tetrahydrogen so there are 4 H Dinitirde so there are 2 N H4N2 Hydrazine would be a acceptable name for this as well, as that is what is commonly know as.

Mg(NO3)2 Magnesium Nitrate Metal (magnesium) and the polyatomic ion (nitrate) Magnesium is in group two so it has +2 charge Nitrate NO3- has a -1 charge The ratio of ions is 1:2 Mg(NO3)2

Cu2SO4 Copper(I) Sulfate This is a metal (copper) and the polyatomic ion sulfate Using the Stock System copper has a +1 charge Sulfate SO4-2 has a -2 charge The ions exist in 2:1 ratio Cu2SO4

Trihydrogen MonoNitride Two non-metals so we use molecule naming convention Trihydrogen so there are 3 H Mononitride so there is 1 N H3N A common name for this compound is ammonia (You will need to learn this when we get to acid and bases in Unit 4).

Potassium Chromate K2CrO4 Made of a metal (potassium) and the polyatomic ion (chromate). Potassium is group 1 so it has +1 charge Chromate CrO4-2 has a -2 charge Potassium Chromate

Gold(III) chloride AuCl3 Made of a metal (gold) and a non-metal (chloride) Use stock system for gold(III) Chloride is in group 7 so it has -1 charge Gold(III) chloride

H2O2 H2O2 Molecule convention because there are two non-metals Use Di because there are 2 H. Use Di because there are 2 O. H2O2 This compound has a common name of hydrogen peroxide

Beryllium Hydroxide Be(OH)2 Made of metal (beryllium) and the polyatomic anion hydroxide Beryllium is a in group 2 so it has a +2 charge Hydroxide OH- has a -1 charge Ion ratio is 2:1 Beryllium Hydroxide

Ammonium Nitride (NH4)3N While this appears to be a molecule, as there are no metals, ammonium is the one polyatomic cation that you should know. Ammonium NH4+ has a +1 charge Nitride is in group five so it has -3 charge Ammonium Nitride

Iron(III) nitrate Fe(NO3)3 Made of metal (iron) and the polyatomic ion nitrate Must use stock system as iron(III) has a +3 charge The polyatomic anion nitrate as a -1 charge Ion ratio is 1:3 Iron(III) nitrate

P2O5 Molecule convention because there are two non-metals Use Di because there are 2 P. Use Pent because there are 5 O. Diphosphorus pentoxide

AgNO3 Made the a metal (silver) and the poly-atomic ion nitrate Silver has a +1 charge Nitrate anion NO3- has a -1 charge Ion ratio is 1:1 Silver nitrate

Ammonium sulfite (NH4)2SO3 While this appears to be a molecule, as there are no metals, ammonium is the one polyatomic cation that you should know. NH4+ is the polyatomic ion ammonium which has +1 charge The sulfite SO3-2 polyatomic ion has a -2 charge Ion ration is 2:1 Ammonium sulfite

Barium Sulfate BaSO4 This is a metal and the polyatomic ion sulfate Barium is a in group 2 so it has a +2 charge Sulfate SO4-2 has a -2 charge Ion ratio is 1:1 Barium Sulfate

LiC2H3O2 This is a metal and the polyatomic anion acetate Lithium is group 1 metal which has +1 charge The polyatomic ion acetate has a -1 charge The ion ratio is 1:1 Lithium acetate Also of note the acetate ion often shows up written different way, you need to be able to handle this

Calcium hydrogen carbonate Ca(HCO3)2 Made of a metal calcium and the polyatomic anion hydrogen carbonate Calcium is a in group 2 so it has a +2 charge The polyatomic anion hydrogen carbonate has a -1 charge The ion ratio is 1:2 Calcium hydrogen carbonate The hydrogen carbonate anion is often called bicarbonate (so the name would be calcium bicarbonate)

Potassium Chloride KCl This made of a metal (potassium) and non-metal (chloride) Potassium is group 1 so it has +1 charge Chloride is group 7 so it has a -1 charge The ratio of ions is 1:1 Potassium Chloride

Magnesium Chloride MgCl2 This is made of metal (magnesium) and a non-metal (chloride) Magnesium is in group 2 so it has +2 charge Chloride is in group 7 so it has -1 charge The ion ratio is 1:2. Magnesium Chloride

Fe2O3 This made of a metal (iron) and non-metal (oxide) Must use the stock system, Fe(III) which has a +3 charge (You know it is iron(III), from the number of oxide anions Oxide is group 6, so it has a -2 charge Ion ration is 2:3 Iron(III) oxide

LiBr This made of a metal (lithium) and non-metal (bromide) Lithium is group 1 so it has +1 charge Bromide is group 7 so it has a -1 charge The ratio of ions is 1:1 Lithium Bromide

Mercury(II) Chloride HgCl2 Made of metal (mercury) and a non-metal (chloride) Mercury(II) uses the Stock System so it has +2 charge Chloride is in group 7 so it has -1 charge Ion ratio is 1:2 Mercury(II) Chloride

Carbon tetrabromide CBr4 Molecule convention because there are two non-metals There is 1 C, but since it is the first element we drop the mono There are 4 Br so use Tetra Carbon tetrabromide

Sulfur Hexaflouride SF6 Molecule convention because there are two non-metals There is 1 S, but since it is the first element we drop the mono There are 6 F so use hexa Sulfur Hexaflouride

Tetrasulfur tetraphosphide Molecule convention because there are two non-metals There are 4 S, so Tetra There are 4 p so use Tetra Tetrasulfur tetraphosphide

Iron(III) Phosphate FePO4 Metal (Iron) and a polyatomic ion (Phosphate) Must use the stock system, Fe(III) which has a +3 charge (You know it is iron(III), from the phosphate ion). Ion ratio is 1:1 Iron(III) Phosphate

Calcium Nitrite Ca(NO2)2 Made of the metal calcium and the polyatomic ion nitrite Calcium is in group 2 so it has +2 charge The nitrite anion NO2- has a -1 charge The ion ratio is 1:2 Calcium Nitrite

Iodine tetraflouride IF4 Molecule convention because there are two non-metals There is 1 I, but since it is the first element we drop the mono There are 4 F so use Tetra Iodine tetraflouride

Sn(CO3)2 Made the metal tin, and the polyatomic anion carbonate Tin uses the stock system and has +4 charge (which you know from the two carbonates) The polyatomic ion carbonate CO3-2 has -1 charge Tin(IV) carbonate

Magnesium Bromide MgBr2 This is made of metal (magnesium) and a non-metal (bromide) Magnesium is in group 2 so it has +2 charge Bromides in group 7 so it has -1 charge The ion ratio is 1:2. Magnesium Bromide

NaCH3CO2 This is a metal and the polyatomic anion acetate Sodium is group 1 metal which has +1 charge The polyatomic ion acetate has a -1 charge The ion ratio is 1:1 Sodium acetate Also of note the acetate ion often shows up written different way, you need to be able to handle this

AgCl Made the a metal (silver) and the poly-atomic ion nitrate Silver has a +1 charge Chloride is in group 7 so it has -1 charge Ion ratio is 1:1 Silver chloride

Phosphorus pentachlouride PCl5 Molecule convention because there are two non-metals There is 1 P, but since it is the first element we drop the mono There are 5 Cl so use Penta Phosphorus pentachlouride

Dichlorine heptoxide Cl2O7 Molecule convention because there are two non-metals The are 2 Cl so use Di There are 7 O so use hepta Dichlorine heptoxide

Dihydrogen monoxide H2O Molecule convention because there are two non-metals There are 2H so use Di The is 1 O, so use mono Dihydrogen monoxide More commonly known as water.