# Oxidation numbers and transition metals

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Thread starter 1 year ago
#1
Confused with this question:
Manganese forms a complex with carbon monoxide, with the formula Mn2(CO)10. What is the oxidation number of manganese in Mn2(CO)10?
Spoiler:
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My answer to this question was +5, but the actual answer is 0
0
1 year ago
#2
(Original post by Saman_B9)
Confused with this question:
Manganese forms a complex with carbon monoxide, with the formula Mn2(CO)10. What is the oxidation number of manganese in Mn2(CO)10?
Spoiler:
Show

My answer to this question was +5, but the actual answer is 0
The answer is zero.
The oxidation states of all uncombined elements is zero.
Carbon monoxide has no charge.
The total charge on a species is the sum of the oxidation states.
Total dcharge = zero
Charges of the ligands = zero
Hence, oxidation state of Mn = 0
1
1 year ago
#3
(Original post by charco)
The answer is zero.
The oxidation states of all uncombined elements is zero.
Carbon monoxide has no charge.
The total charge on a species is the sum of the oxidation states.
Total dcharge = zero
Charges of the ligands = zero
Hence, oxidation state of Mn = 0
Ligands always have a charge of 0?
0
1 year ago
#4
(Original post by Presto)
Ligands always have a charge of 0?
No, but carbon monoxide does.
0
1 year ago
#5
(Original post by Presto)
Ligands always have a charge of 0?
Cl-, OH-, C2O42- et.al. happily are ligands (they all can form dative bonds to the central metal ion).
0
Thread starter 1 year ago
#6
Thank you for helping
I can understand it now.
(Original post by charco)
The answer is zero.
The oxidation states of all uncombined elements is zero.
Carbon monoxide has no charge.
The total charge on a species is the sum of the oxidation states.
Total dcharge = zero
Charges of the ligands = zero
Hence, oxidation state of Mn = 0
0
Thread starter 1 year ago
#7
(Original post by Pigster)
Cl-, OH-, C2O42- et.al. happily are ligands (they all can form dative bonds to the central metal ion).
Would these ligands affect the charge of the central metal ion?
0
1 year ago
#8
(Original post by Saman_B9)
Would these ligands affect the charge of the central metal ion?
No, but when they combine to make a complex ion, you start talking about the charge on the complex ion, rather than the charge on the metal ion which you refer to as the oxidation number.
1
Thread starter 1 year ago
#9
(Original post by Pigster)
No, but when they combine to make a complex ion, you start talking about the charge on the complex ion, rather than the charge on the metal ion which you refer to as the oxidation number.
Okay
Thanks for helping
0
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