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Naming Ions and Writing Formulas for Ionic Compounds

Naming Ions and Writing Formulas for Ionic Compounds. Monoatomic ions. single atom with a charge Cation - + charge from losing e- Anion - - charge from gaining e- Cations are the name of the element. For example: Na+ sodium ion Mg 2+ magnesium ion

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Naming Ions and Writing Formulas for Ionic Compounds

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  1. Naming Ions and Writing Formulas for Ionic Compounds

  2. Monoatomic ions • single atom with a charge • Cation - + charge from losing e- • Anion - - charge from gaining e- • Cations are the name of the element. For example: Na+ sodium ion Mg2+ magnesium ion • Anions change the ending to –ide. For example: O2- oxide Cl- chloride

  3. -1 Charge Acetate CH3COO- or C2H3O2- Nitrite NO2- Nitrate NO3- Cyanide CN- Hydroxide OH- Hypochlorite ClO- Chlorite ClO2- Chlorate ClO3- Perchlorate ClO4- -2 Charge Sulfite SO32- Sulfate SO42- Carbonate CO32- -3 Charge Phosphate PO43- +1 Charge Ammonium NH4+ Polyatomic ionscomposed of more than one atom

  4. NAMING/WRITING BINARY IONIC COMPOUNDS • Binary – compound made of two kinds of elements • Examples: NaCl, MgBr2, FeI3

  5. Writing the formulas Cation (+) first Anion (-) last “criss-cross” method Naming the formulas Cation (+) first Anion (-) last Examples: NaCl sodium chloride MgBr2 magnesium bromide FeI3 iron iodide

  6. Writing the formulas Cation (+) first Anion (-) last “criss-cross” method Naming the formulas Cation (+) first Anion (-) last Examples: NH4Cl ammonium chloride Ca(OH)2 calcium hydroxide Na2SO4 sodium sulfate NAMING/WRITING COMPOUNDS WITH POLYATOMIC IONS

  7. Stock Systemusing Roman numerals in nomenclature • Used for transition metals with more than one possible charge (there are others) FOR EXAMPLE: FeCl2 and FeCl3 are both iron chloride. To differentiate, use the stock system: • FeCl2 = iron (II) chloride • FeCl3 = iron (III) chloride • Any element to the left of the zig-zag line except groups 1 and 2, Al, Ga, Zn, In, Cd, and Ag

  8. Hinge Questions: Write the names for these formulas. • CaI2 • NiO • Al2S3

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