Coordination metals?

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I thought that as a general rule when writing out compound names (in full) involving a coordination metal, the charge of the coord metal must be stated in Roman Numerals. If nothing is specified than a charge of +1 is assumed.

But I came across a compound involving zinc written zinc..... without any roman numeral so I assumed it had +1 charge when bound within the compound. But it turned out to have +2 charge. Why don't they specify it by writing zinc(II)..... ?
 

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  • #2
Gokul43201
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I thought that as a general rule when writing out compound names (in full) involving a coordination metal, the charge of the coord metal must be stated in Roman Numerals. If nothing is specified than a charge of +1 is assumed.
Where did you get that last bit from? From what I recall, the oxidation state may be left unspecified if the metal is in its most common oxidation state. For Zinc, the +2 oxidation state is most common.
 
  • #3
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Good point, I think I made it up. Zinc likes to lose 2 electrons in its outer 4S shell doesn't it.
 
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Gokul43201
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Yes, that's right.
 
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