7 Monatomic Ions One-atom ion Mg2+ Br- Use the periodic table. What is the formula for beryllium ion?Iodide ion?Nitride ion?
8 Common Monatomic Ions Group Atoms Charge on Ions 1 H, Li, Na, K, Rb, Cs1+2Be, Mg, Ca, Sr, Ba2+15N, P, As3-16O, S, Se, Te2-17F, Cl, Br, I1-
9 Monatomic Metal Ions Group Common Ions 3 Sc3+, Y3+, La3+ 4 Ti2+, Ti3+ 5V2+, V3+6Cr2+, Cr3+7Mn2+, Mn3+, Tc2+8Fe2+, Fe3+
10 Continued Group Common Ions 9 Co2+, Co 3+ 10 Ni2+, Pd2+, Pt2+, Pt 4+ 11Cu+, Cu2+, Ag+, Au+, Au 3+12Zn2+, Cd2+, Hg2+13Al 3+, Ga2+, Ga 3+, In+,In2+, In 3+, Tl+, Tl 3+14Sn2+, Sn 4+, Pb2+, Pb 4+
11 Oxidation Numbers The charge on a monatomic ion Oxidation number or oxidation stateEquals the number of electrons transferred from the atom to form the ionNotice some ions have more than one oxidation state – with the d orbital elements
12 Binary Ionic Compounds Symbol Cation then AnionSubscripts equals number of ionsif no subscript then it is 1
13 How to figure the Formula Write the symbol and charge for each ionFind the ratio of ions in the formulaOverall charge must be zeroSubscripts times the charges sum to zero
14 Example 7.1Determine the formula for the ionic compound formed from potassium and oxygen.Potassium group 1 K+Oxygen group 16 O2-Ratio: 2:1K2OEvaluate: 2 K ions (+1) + 1 O ion (-2)= 2 (+1) + 1(-2) = 2 + (-2) = 0
15 Example 7.2Determine the formula for the compound formed from aluminum ions and sulfide ions.Aluminum group 13 Al3+Sulfur group 16 S2-Ratio: 2:3Al2S3Evaluate: 2 Al ions (3) + 3 S ions (-2)= 2 (3) + 3 (-2) = 6 + (-6) = 0
16 Practice Write the ionic compound formula. Potassium and iodideMagnesium and chlorideAluminum and bromideCesium and nitrideKIMgCl2AlBr2Cs3N
17 Polyatomic Ionic Compounds Ionic compounds made from more than one atom.Popular ionsAmmonium NH4+Nitrite NO2-Nitrate NO3-Hydroxide OH-Cyanide CN-
18 Formulas for Polyatomic Ionic Compounds Mg(NO3)2 Mg2+ + (NO3)- ratio 1:2Al(NO3) Al3+ + (NO3)- ratio 1:3Use parenthesis to surround the polyatomic ion
19 Practice Write the formula for ionic compounds. Sodium and nitrate Calcium and chlorateAluminum and carbonate24. Ratio 1:1Na+ + (NO3)- Na(NO3)25. Ratio 1:2Ca2+ + (ClO3)- Ca(ClO3)226. Ratio 2:3Al3++(CO3)2- Al2(CO3)3
20 Naming Ionic Compounds Name the cation followed by the anionFor monatomic cations use the element nameFor monatomic anions change the suffix to –ide.CsBr Cesium BromideRule 1Rule 2Rule 3
21 4. To distinguish between multiple oxidation numbers of the same element use (roman numerals) after the symbol.Fe2+ + O2- FeO Iron (II) OxideFe3+ + O2- Fe2O3 Iron (III) Oxide
22 When the compound contains a polyatomic ions use the polyatomic ion name. NaOH is sodium hydroxide (OH)-(NH4)2S is ammonium sulfide (NH4)+
24 Practice Problems Name the following compounds. NaBr CaCl2 KOH Cu(NO3)2Ag2CrO4
25 Each Student Make a 5 x 5 chart Across the top write 5 non-metal ions, with one polyatomic anionAlong the side list 5 metals, with ammonium ion.Trade charts with another student, name each compound in the boxes.Trade back and check.
26 SummaryA formula unit gives the ratio of cations to anions in the ionic compound.A monatomic ion is formed from one atom. The charge of amonatomic ion is its oxidation number.Roman numerals indicate the oxidation number of cations having multiple possible oxidation states.
27 Polyatomic ions consist of more then one atom and act as a single unit. To indicate more than one polyatomic ion in a chemical formula, place parentheses around the polyatomic ion and use a subscript.
28 Practice ProblemsState the order in which the ions associated with a compound composed of potassium and bromine would be written in the chemical formula and the compound name.Describe the difference between a monatomic ion and a polyatomic ion, and give an example of each.
29 36. Ion X has a charge of 2+ and ion Y has a charge of 1- 36. Ion X has a charge of 2+ and ion Y has a charge of 1-. Write the formula unit of the compound formed from the ions.State the name and formula for the compound formed from Mg and Cl.Write the name and formula for the compound formed from sodium ions and nitrite ions.
30 Exit TicketThis is the formula for making artificial ocean water often used in saltwater aquariums. Mix 24.72g NaCl, 0.67g KCl, 1.36g CaCl, 4.66g MgCl2, 6.29g MgSO4 and 0.18g NaHCO3.Name each ionic compound.