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WHY DO WE NEED A ROMAN NUMERAL? Some metals can take MORE THAN ONE charge The roman numeral always indicates the charge on the metal in that compound The roman numeral does NOT tell you the number of metal atoms present in the compound.
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H O W T O N A M E C O M P O U N D S T H A T C O N T A I N T R A N S I T I O N M E T A L S
NAMING IONIC COMPOUNDS: PART II
USING ROMAN NUMERALS TO DENOTE THE CHARGE OF THE TRANSITION METAL
FeO Fe2O3
WHY DO WE NEED A ROMAN NUMERAL?
• Some metals can take MORE THAN ONE charge • The roman numeral always indicates the charge
on the metal in that compound• The roman numeral does NOT tell you the
number of metal atoms present in the compound.
LET’S HAVE ANOTHER TRY AT THIS…
WS2 WS3
YOU TRY SOME ON YOUR OWNPAUSE THE VIDEO AND ANSWER THESE QUESTIONS. WHEN YOU HAVE ANSWERED
THEM, RESTART THE VIDEO.
What is the name of CuCl2
What is the name of PbS2
YOU TRY SOME ON YOUR OWNPAUSE THE VIDEO AND ANSWER THESE QUESTIONS. WHEN YOU HAVE ANSWERED
THEM, RESTART THE VIDEO.
What is the name of CuCl2
What is the name of PbS2
Here is what we initially know about the charges
Cu? Cl-1
Since there are two Cl- ions, Cu needs to be in its Cu+2 oxidation state
to balance out the negative.
Copper (II) chloride
Here is what we initially know about the charges
Pb? S-2
Since there are two S-2
ions, Pb needs to be in its Pb+4 oxidation state
to balance out the negative.
Lead (IV) sulfide
TURNING THE PROCESS AROUNDWhat is the formula
for copper (I)
phosphide?
What is the formula for
tin (II) fluoride?
A SIDE NOTE: THE MERCURY (I) CATION
What is different about the mercury (I) ion?
What is the formula for mercury (I) iodide?
YOU TRY SOME ON YOUR OWNPAUSE THE VIDEO AND ANSWER THESE QUESTIONS. WHEN YOU HAVE ANSWERED
THEM, RESTART THE VIDEO.
What is the formula for iron (III) sulfide
What is the formula for mercury (II) chloride?
YOU TRY SOME ON YOUR OWNPAUSE THE VIDEO AND ANSWER THESE QUESTIONS. WHEN YOU HAVE ANSWERED
THEM, RESTART THE VIDEO.
What is the formula for iron (III) sulfide
What is the formula for mercury (II) chloride?
Here is what we initially know about the charges
Fe3+ S2-
Since the LCM for a 3 & 2 is 6, we will need two Fe3+ ions and three S2-
ions to balance out the charges
Fe2S3
Here is what we initially know about the charges
Hg2+ Cl-
You will need two Cl- ions to balance out the
+2 charge on the mercury.
HgCl2
