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What are POLYATOMIC IONS?
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What are POLYATOMIC IONS?
Lets first review what a monatomic ion is What is a group of atoms with charge? back to naming compounds
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In a single atom (monatomic), charge results
from having either more electrons or less electrons than protons. More electrons than protons = negative charge (anions) + + Less electrons than protons = positive charge (cations)
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Mg 2+ Example: The magnesium ion has two less electrons than protons
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2+ two less electrons than protons Mg Example: The magnesium ion has
back to polyatomic ions Example: The magnesium ion has two less electrons than protons
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N O
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two or more atoms covalently bonded together.
In a polyatomic ion, two or more atoms covalently bonded together. N O
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1– N O Together, they carry a charge
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1– The nitrate ion (NO3–) has, in total, one more electron
than protons
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Mg(NO3)2 When balancing charges in an ionic compound,
the polyatomic ion acts as a single unit of charge: N O 1- N O 1- Mg 2+ Mg(NO3)2
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1- 1- 2+ N O N O Mg Mg(NO3)2 2+
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1- the charges are balanced 1- 2+ N O N O Mg Mg(NO3)2 2+ 2-
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back to first slide back to naming compounds previous slide
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