writing ionic formulas with polyatomic ions n.
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Writing Ionic Formulas with Polyatomic Ions. What is a Polyatomic Ion??. Polyatomic ion – a group of covalently bonded atoms in which the whole group is positively or negatively charged. Common Polyatomic Ions. NH 4 +1 ammonium OH -1 hydroxide NO 3 -1 nitrate

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Presentation Transcript
what is a polyatomic ion
What is a Polyatomic Ion??
  • Polyatomic ion – a group of covalently bonded atoms in which the whole group is positively or negatively charged.
common polyatomic ions
Common Polyatomic Ions
  • NH4 +1 ammonium
  • OH -1 hydroxide
  • NO3 -1 nitrate
  • CO3 -2 carbonate
  • SO4 -2 sulfate
  • PO4 -3 phosphate
writing formulas with polyatomics
Writing Formulas With Polyatomics
  • Polyatomics are negative or positive, just as elements are
  • Polyatomics cannot be separated – they come with their own subscripts that cannot be changed.
writing formulas with polyatomics cont
Writing Formulas With Polyatomics (Cont)
  • The subscripts of polyatomics can NEVER be changed.
  • NEVER change the subscript of a polyatomic!
writing formulas with polyatomics cont1
Writing Formulas With Polyatomics (Cont)
  • You can use “crossing out” with polyatomics
  • If you need more than one polyatomic, you must put it in parentheses ( ), then put the subscript you assigned to it outside the parentheses
example 1
Example 1
  • Lithium and nitrate
  • First write the element symbols
  • Li NO3
  • Then write the charges as superscripts
  • Li+1 NO3-1
  • Cross out or balance out
  • LiNO3
example 2
Example 2
  • Magnesium and hydroxide
  • First write the element symbols
  • Mg OH
  • Then write the charges as superscripts
  • Mg+2 OH-1
  • Cross out or balance out
  • Mg(OH)2
example 3
Example 3
  • Aluminum and carbonate
  • First write the element symbols
  • Al CO3
  • Then write the charges as superscripts
  • Al+3 CO3-2
  • Cross out or balance out
  • Al2(CO3)3
example 4
Example 4
  • Potassium and phosphate
  • First write the element symbols
  • K PO4
  • Then write the charges as superscripts
  • K+1 PO4-3
  • Cross out or balance out
  • K3PO4
naming with polyatomics
Naming with Polyatomics
  • If the polyatomic is negative
  • Write the name of the 1st element in the compound
  • Write the name of the polyatomic
examples
Examples
  • LiNO3 = lithium nitrate
  • Na2SO4 = sodium sulfate
  • Mg(OH)2 = magnesium hydroxide
naming with polyatomics ii
Naming With Polyatomics, II
  • If the polyatomic is positive
  • Write the name of the polyatomic
  • Write the root of the 2nd element in the compound
  • Add the ending –ide to the root of the name of the 2nd element
more examples
More Examples
  • NH4F = ammonium fluoride
  • (NH4)3P = ammonium phosphide
  • (NH4)3PO4 = ammonium phosphate