Polyatomic Ions Lesson 7.

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Presentation transcript:

Polyatomic Ions Lesson 7

Monatomic Ions Ions that are composed of one atom are called monatomic ions. Monoatomic Ion- an ion composed of only one atom. We have only looked at these so far

Polyatomic Ions Polyatomic Ions are ions that are composed of more than one atom. The entire molecule carries a charge to it.

Polyatomic Ions Example- NO3- SO42- PO43-

Bonding Ionic Bonding with polyatomic ions occurs in the same manner as it does with binary atomic molecules. Use the crossover method Be sure that the charge that is crossed over applies to the whole polyatomic ion. If the charge is greater than 1, use brackets around the polyatomic ion to indicate the number applies to the whole ion.

Example 1 Sodium nitrate Step 1 Na + NO3- Step 2 1+ 1- Na NO3 Step 3 1+ 1- Na NO3 Step 3 Step 4 NaNO3 Sodium nitrate

Example 2 Magnesium nitrate Step 1 Mg + NO3- Step 2 2+ 1- Mg NO3 2+ 1- Mg NO3 Step 3 Step 4 Mg (NO3)2 Magnesium nitrate

Practice Mg + ClO3- = Na + SiO32- = Fr + HS- = NH4+ + Cl = Li + Cl = Be + O22- = Sr + PO43- = Al + BO33- = Al + SO42- = Na + OH- =

Naming Ionic Polyatomic compounds: IUPAC Multivalent: Metal (charge) polyatomic ion Monovalent: Metal polyatomic ion Tertiary ionic compounds are comprised of a metal ion and a polyatomic ion. Write the polyatomic ions in the same way as monatomic ions.

Examples NaOH = Cu(ClO3)2 = Tin (IV) chlorate = sodium hydroxide (NOT MULTIVALENT) Cu(ClO3)2 = copper (II) chlorate Tin (IV) chlorate = Sn (ClO3)4

NOTE: Look at the resource page, notice the * This means that bromine and iodine will have the same ending if there are the same number of oxygen's as the chlorine.

Oxyanions = a polyatomic ion that includes oxygen Their name depends on how many Oxygen’s it has in the poly atomic ion. (Cl, I and Br share the same prefixes and suffixes for the same # of oxygens) Example ClO- hypochlorite ion hypo-_________-ite ClO2- chlorite ion __________-ite ClO3- chlorate ion __________-ate ClO4- perchlorate ion per-_______-ate Iod or Bor Iod or Bor Iod or Bor Iod or Bor

Practice Do the questions on the note.