ionic compound names and formulas. monovalent ionic binary compounds “+” means lose “-”...
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Ionic Compound Names
and Formulas
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Monovalent Ionic Binary Compounds
“+” means lose “-” means gain The number (+1,+2,+3)represents the
number of electrons gained or lost to achieve a noble gas configuration
Also called “oxidation number” Is at the top of the (family) column on the
periodic table
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Monovalent Ionic Binary Compounds
Cation has only one possible charge. Group 1A and 2A metals have only one oxidation
number [+1, +2] Groups 3A, 4A, 5A, 6A, and 7A usually only have
one oxidation number [+3, +4, -3, -2, -1] Monovalent Transition Metals:
Zn = +2 Ag = +1 Cd = +2 Ni = +2
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Naming Ionic Compounds
Name cation first and the anion second Monoatomic cations use element names Monoatomic anions take the name from the
root of the element name plus the suffix “ide”
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Polyatomic Ions
Ions made up of more than one atom Act as an individual ion Never change the subscripts of the ion If a subscript is needed, put parentheses
around the polyatomic ion
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Polyatomic Ions
If a compound contains a polyatomic ion, use the name of the ion
Some polyatomic anions have a names ending in -ite for the lower # of oxygens and –ate for more oxygens.
NO2- nitrite NO3
- nitrate
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Divalent Ionic Binary Compounds
Cation can have two charges, so the charge must be named.
Transitional metals and metals on the right side of the periodic table often have more than one oxidation number.
The oxidation number will be written with a Roman numeral after the name of the metal. This is known as the stock system.(see handout)
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Divalent Ionic Binary Compounds
A Roman numeral in parentheses, preceded by the name of the element, is used for elements that can form more than one positive ion. This is usually seen with metals.
Fe2+ Iron (II) Cu+ Copper (I) Fe3+ Iron (III) Cu2+ Copper (II)
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Writing Chemical Formulas
Rule 1: To write the chemical formula for an ionic compound having different oxidation numbers: Write the symbols for the elements first, listing the metal
first.
Aluminum + Oxygen = Al O Above each element symbol, place the oxidation
number(charge) of each element.
Al+3 O-2
To determine the correct subscripts for the formula, criss-cross the oxidation numbers and drop the signs.
Al2O3
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Writing Chemical Formulas
Rule 2: chemical formula for ionic compounds formed by two elements with the same oxidation number: Follow the same steps, except drop the
subscripts, because it is balanced. Potassium + Chlorine = K+1 Cl-1= KCl Magnesium + Oxygen = Mg+2 O-2 = MgO Aluminum + Phosphorous = Al+3 P-3 = AlP
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Writing Chemical Formulas
Rule 3: Formula containing a polyatomic ion, follow the rules above and treat the ion as a single unit. Put the ion in parentheses if a subscript is needed. DO NOT CHANGE THE ION FORMULA!
Ca+2 & NO3-1 = Ca(NO3)2
NH4+1 & Cl-1 = NH4Cl
NH4+1 & P-3 = (NH4)3P
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Practice Formula Writing
Cation (+)
Anion (-)
Oxidation #s
Criss-Cross Formula (no charges)
Na Cl Na+1Cl-1 Na-1Cl+1 NaCl
H O H+1O-2 H-2O+1 H2O
Ca Br Ca+2Br-1 Ca-1Br+2 CaBr2
Li Cr2O7-2 Li+1 Cr2O7
-2 Li-2(Cr2O7)+1 Li2Cr2O7
K I K+1I-1 K-1I+1 KI
Ca PO4-3 Ca+2PO4
-3 Ca-3(PO4)+2 Ca3(PO4)2
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Naming Molecules
Use your Naming Compounds handout and follow the steps for naming binary molecular compounds.
Ready???
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Naming Compounds
Rule 1: For an ionic compound that contains only two elements (binary compound), name the metal first, then add the suffix –ide to the end of the nonmetal NaCl = sodium chloride K2S = potassium sulfide CaO = calcium oxide Al2O3 = aluminum oxide
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Naming Compounds
Rule 2: For compounds containing three elements (ternary compounds), such as a metal combined with a polyatomic ion that behaves as a nonmetal, name the metal first and name the polyatomic ion last. NaNO3 = sodium nitrate NaNO2 = sodium nitrite CaSO4 = calcium sulfate
KNOW YOUR POLYATOMIC IONS!!!!!
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Naming Compounds
Rule 3: For compounds containing two polyatomic ions, one acting as the metal and the other as a nonmetal, name the polyatomic ion with the positive oxidation number first, and then the polyatomic ion with the negative oxidation number. (NH4)2SO4 = ammonium sulfate NH4OH = ammonium hydroxide
Note: If ammonium is paired with a nonmetal, the nonmetal will end in –ide (NH4)3N = ammonium nitride
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Naming Compounds
Rule 4: If a compound contains a metal with an oxidation number that can vary, indicate the oxidation number of the metal with a Roman numeral written after the name of the metal. These metals include: Cr, Mn, Fe, Co, Ni, Cu, Hg, Sn, & Pb. FeO = iron (II) oxide Fe2O3 = iron (III) oxide
You may also use the common names FeO = ferrous oxide Fe2O3 = ferric oxide
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Naming Compounds Rule 5: For binary covalent compounds (containing
all nonmetals), use prefixes to represent the atoms of an element. The name ends in –ide.
Mono = 1 Hexa = 6Di = 2 Hepta = 7Tri = 3 Octa = 8Tetra = 4 Nona = 9Penta = 5 Deca = 10
CO = carbon monoxide CO2 = carbon dioxide NO = nitrogen monoxide P2O3 = diphosphorous trioxide
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Binary Acids
Contains hydrogen and another element Name begins with “hydro” and ends with “ic”.
The rest of the name is made up of the root of the second element. Hydro-”element”-ic acid
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Oxyacids
Name consists of the root of the anion (usually a polyatomic ion), a suffix “ic” or “ous” and the word acid.
“ate” polyatomic ion names are replaced with “ic”
“ite” polyatomic ion names are replaced with “ous”