Ions of some transition elements can have more than one possible charge. Such elements are called MULTIVALENT species. For example, what are the 2 possible charges for copper – Cu? ◦ _________________ ◦ _________________ WE use ROMAN NUMERALS to indicate the type of charge on these multivalent ions. ◦ 1+ I ◦ 2+ II ◦ 3+ III ◦ 4+ IV ◦ 5+ V ◦ 6+ VI ONLY USE WITH MULTIVALENT IONS! MULTIVALENT IONIC COMPOUNDS
MULTIVALENT IONIC COMPOUNDS. Ions of some transition elements can have more than one possible charge. Such elements are called MULTIVALENT species. For example, what are the 2 possible charges for copper – Cu? _________________ _________________ - PowerPoint PPT Presentation
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Ions of some transition elements can have more than one possible charge.
Such elements are called MULTIVALENT species.
For example, what are the 2 possible charges for copper – Cu?◦_________________◦_________________
WE use ROMAN NUMERALS to indicate the type of charge on these multivalent ions.
◦1+ I◦2+ II◦3+ III◦4+ IV◦5+ V◦6+ VI
ONLY USE WITH MULTIVALENT IONS!
MULTIVALENT IONIC COMPOUNDS
RULES1. Use ROMAN NUMERALS to
determine the ION CHARGE of the MULTIVALENT ION.
2. If ROMAN NUMERAL are NOT given, use the charge found on the top in each box on the table.
EXAMPLE: copper (II) oxide
_________________________
GIVEN NAME, WRITE FORMULA
lead (IV) sulfide_________________________
tin sulfide_________________________
GIVEN NAME, WRITE FORMULA
Do the sheet on the following page!
Remember to ONLY use the ROMAN NUMERAL with the MULTIVALENT IONS!!!
HOMEWORK!!!
RULES1. Write the names of the ions.
2. Write the ROMAN NUMERAL for the MULTIVALENT ION. There are 2 METHODS:
1. METHOD 1 Charges must add up to zero.
2. METHOD 2 Charge of Anion X Subscript of AnionSubscript of Cation
GIVEN FORMULA, WRITE NAME
PbI2 _________________________
Fe2O3 _________________________
GIVEN FORMULA, WRITE NAME
CuCl _________________________
MnO2 _________________________
GIVEN FORMULA, WRITE NAME
Do the next 2 sheets for homework!
Remember, doing some workings can help prevent any mistakes!!!
HOMEWORK!!!
DEFINITION:◦Polyatomic ions are GROUPS OF ATOMS acting as 1 ION, carrying an OVERALL CHARGE.
On the back of your periodic table, there is a POLYATOMIC ION TABLE.
Endings of polyatomic ions are easily recognizable as they are often –ATE or –ITE, providing a good clue.
NOTE: After crossing over the charges to get the formula, make sure you are using thesimplest ratio between the ions.eg. magnesium oxide - Mg2O2 becomes MgO
DON’T USE PREFIXES FOR IONIC COMPOUNDS.
1. Simple Ions
Names Formulas- write the name of the positive ion - determine the charge on each ion
- write the name of the negative ion - cross over the charges to write the formula followed by -ide
eg. NaCl sodium chloride eg. calcium phosphide
Mg3N2 magnesium nitride Ca2+ P3-
Ca3P2
2. Polyatomic Ions
Names Formulas- write the name of the positive ion - determine the charge on each ion
- write the name of the negative ion - cross over the charges to write the formula
eg. CaSO4 calcium sulfate eg. magnesium nitrate
Al(OH)3 aluminum hydroxide Mg2+ NO3-
Mg(NO3)2
3. MultiValent Metals- use Roman Numerals to indicate the ion charge(Stock System)
OR
- use the suffix -ic to indicate the smaller ion charge or -ous for the larger ion charge.
NOTE: After crossing over the charges to get the formula, make sure you are using thesimplest ratio between the ions.eg. magnesium oxide - Mg2O2 becomes MgO
DON’T USE PREFIXES FOR IONIC COMPOUNDS.
Hydrated ionic compounds have WATER attached to their crystal lattice structure.
Solutions become hydrated when they are crystallized from a water solution.
They are often recognizable by eye because they are often SHINY and TRANSLUCENT.
Examples: ◦ Bluestone, Epsom salts, Rock salts
BLUESTONE CuSO4 ∙5H2O◦ 5 H2O molecules attached to each CuSO4
compound.◦ The “dot” represents a weak bond.
HYDRATED IONIC COMPOUNDS
We indicate the presence of water with the word HYDRATE and we indicate the number of water molecules with our GREEK PREFIXES:
MONO 1, DI 2, TRI 3, TETRA 4, PENTA 5, HEXA 6, HEPTA 7, OCTA 8, NONA 9, DECA 10