Chem: Chromium, a transition metal, forms both the Cr2+ and Cr 3+ ions.?

Write the formulas for the ionic compounds formed when each of these ions react next to

A. Florine
B. Oxygen.




I don't understand this....can someone help? thankfulness
Answers:
A.
Cr2+ + 2F >> CrF2
Cr3+ + 3F >> CrF3


B.
2Cr2+ + O2 >> 2CrO
4Cr3+ + 3O2 >> 2Cr2O3 Source(s): My Brain
Cr2 + F2 = CrF2

Cr3 + F2 = CrF3

Cr2 + O2 = Cr2O3

Cr3 + O2 = CrO3
Cr2+ + 2F- --> CrF2
Cr2+ + O2- --> CrO

Cr3+ + 3F- --> CrF3
2Cr3+ + 3O2- --> Cr2O3

i think thats what your looking for

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