Polyatomic Ions
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Polyatomic Ions

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    Polyatomic Ions Polyatomic Ions Presentation Transcript

    • What are POLYATOMIC IONS?
    • What are POLYATOMIC IONS? What is a group of atoms with charge? back to naming compounds Lets first review what a monatomic ion is
    • 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 ) + + + + +
    • Example: The magnesium ion has two less electrons than protons 2+ Mg
    • Example: The magnesium ion has two less electrons than protons 2+ back to polyatomic ions Mg
    • N O O O
    • In a polyatomic ion, two or more atoms covalently bonded together. N O O O
    • Together , they carry a charge N O O O 1 –
    • The nitrate ion (NO 3 – ) has, in total, one more electron than protons N O O O 1 –
    • 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 -
    • 2+ 1 - 1 - 2+ Mg(NO 3 ) 2 N O O O Mg N O O O
    • 2+ 1 - 1 - 2+ 2- Mg(NO 3 ) 2 N O O O Mg N O O O the charges are balanced