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Polyatomic Ions
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  • 1. What are POLYATOMIC IONS?
  • 2. What are POLYATOMIC IONS? What is a group of atoms with charge? back to naming compounds Lets first review what a monatomic ion is
  • 3. In a single atom ( monatomic ), charge results from having either more electrons or less electrons than protons. + + + + + Less electrons than protons = positive charge ( cations ) More electrons than protons = negative charge ( anions ) + + + + +
  • 4. Example: The magnesium ion has two less electrons than protons 2+ Mg
  • 5. Example: The magnesium ion has two less electrons than protons 2+ back to polyatomic ions Mg
  • 6. N O O O
  • 7. In a polyatomic ion, two or more atoms covalently bonded together. N O O O
  • 8. Together , they carry a charge N O O O 1 –
  • 9. The nitrate ion (NO 3 – ) has, in total, one more electron than protons N O O O 1 –
  • 10. When balancing charges in an ionic compound, the polyatomic ion acts as a single unit of charge: Mg(NO 3 ) 2 Mg 2+ N O O O 1 - N O O O 1 -
  • 11. 2+ 1 - 1 - 2+ Mg(NO 3 ) 2 N O O O Mg N O O O
  • 12. 2+ 1 - 1 - 2+ 2- Mg(NO 3 ) 2 N O O O Mg N O O O the charges are balanced