The Metal Nonmetal Bond

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IONIC BONDING

• The Metal Nonmetal Bond

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When a metal and nonmetal come together, a pair
of electrons acts as a bond. They each become
ions.
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The Rules

• Metal first, nonmetal second
• Nonmetal ion becomes ide
• Metal is positve, nonmetal is negative
• Charges must balance to zero
• Formula uses a subscript to balance charges
• Example MgCl2 Na2O

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Practice
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Answers
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Solutions

• When ionic compounds are put in water, they
  dissove into ions

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Polyatomic ions are groups of atoms bonded
together with a charge.

• Examples
• OH-1 hydroxide
• NO3-1 nitrate
• PO4-3 phosphate
• SO4-2 sulfate

• They behave just like single atom ions.

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Practice Use polyatomic ions just like any other
ion But when you have more than one , use
parentheses.

• barium hydroxide Ba(OH)2
• strontium nitrate
• lithium phosphate
• potassium sulfate
• Notice parentheses show multiple ions.

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Answers

• barium hydroxide Ba(OH)2
• strontium nitrate Sr(NO3)2
• lithium phosphate Li3PO4
• potassium sulfate K2SO4

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Transition metals Metals that have more than one
possible charge

• Cobalt Co2, Co3
• Copper Cu, Cu2
• Iron Fe2, Fe3
• Lead Pb2, Pb4
• When writing the names, always use roman numerals
  to show the charge.

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Examples

• Cobalt (II) Co2, Cobalt (III) Co3
• Copper(I), Cu, or Copper (II), Cu2
• Iron(II) Fe2, or iron (III), Fe3
• Lead(II), Pb2, or lead (IV), Pb4
• Each of these behaves completely different than
  the others!!! Show the numbers!

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Practice!

• Lead (IV) hydroxide
• Copper (II) nitrate
• CoPO4
• Fe2(SO4)3

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Answers

• Lead(IV) hydroxide Pb(OH)4
• Copper(II) nitrate Cu(NO3)2
• Cobalt (III) phosphate CoPO4
• Iron (III) sulfate Fe2(SO4)3

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The End!