How do I know the romantic numerals of transitional metal

Chemistry
Tutor: None Selected Time limit: 1 Day

Change from formula to name: 

NiNO3 -> Nickel (?) Nitrate

Cr3(Po4)2 -> Chromium (?) phosphate

 please explain how you find the ?, that is the number of transitional metal. 

Jun 12th, 2015

Thank you for the opportunity to help you with your question!

NiNO3 -> Nickel (I) Nitrate  .Each NO3 is -1...Therefore, nickel must be +1

Cr3(Po4)2 -> Chromium (II) phosphate...Po4 has -3.so total -6..cr should be +2.


All compounds must have a total charge of zero, so sometimes you must use subscripts to balance the charges of the cations and anions. 

When forming compounds with transition metals, it is necessary to know which of the different charges for the metal is being used. This information is either provided or can be figured out from the charge of the anion.

 The subscript for the polyatomic ion is located outside of the parentheses.

Please let me know if you need any clarification. I'm always happy to answer your questions.
Jun 12th, 2015

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