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What are POLYATOMIC IONS?

What are POLYATOMIC IONS?. What are POLYATOMIC IONS?. Lets first review what a monatomic ion is. What is a group of atoms with charge?. back to naming compounds. More electrons than protons = negative charge ( anions ). +. +. +. +. +. Less electrons than protons

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What are POLYATOMIC IONS?

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  1. What are POLYATOMIC IONS?

  2. What are POLYATOMIC IONS? Lets first review what a monatomic ion is What is a group of atoms with charge? back to naming compounds

  3. More electrons than protons = negative charge (anions) + + + + + Less electrons than protons = positive charge (cations) + + + + + In a single atom (monatomic), charge results from having either more electrons or less electrons than protons.

  4. Mg 2+ Example: The magnesium ion has two less electrons than protons

  5. Mg 2+ back to polyatomic ions Example: The magnesium ion has two less electrons than protons

  6. O N O O

  7. O N O O In a polyatomic ion, two or more atoms are covalently bonded together.

  8. 1– O N O O Together, they carry a charge

  9. 1– O N O O The nitrate ion (NO3–) has, in total, one more electron than protons (count them! 31 p+, 32 e-)

  10. 1- 1- 2+ O O N N O O Mg O O When balancing charges in an ionic compound, the polyatomic ion acts as a single unit of charge: Mg(NO3)2

  11. O O N N O O Mg O O 1- 1- 2+ Mg(NO3)2 2+

  12. O O N N O O Mg O O the charges are balanced 1- 1- 2+ Mg(NO3)2 2+ 2-

  13. back to first slide back to naming compounds previous slide

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