In the compound \[YB{{a}_{2}}C{{u}_{3}}{{O}_{7}}\] which shows superconductivity, what is the oxidation state of cu? Assume the rare earth element yttrium is in its usual +3 oxidation state.

In the compound \[YB{{a}_{2}}C{{u}_{3}}{{O}_{7}}\] which shows superco

1.	In the compound \[YB{{a}_{2}}C{{u}_{3}}{{O}_{7}}\] which shows superconductivity, what is the oxidation state of cu? Assume the rare earth element yttrium is in its usual +3 oxidation state.
A.	\[+\frac{7}{3}\]
B.	\[-\frac{7}{3}\]
C.	\[+\frac{5}{3}\]
D.	\[-\frac{5}{3}\]
Answer» B. \[-\frac{7}{3}\]

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In the compound \[YB{{a}_{2}}C{{u}_{3}}{{O}_{7}}\] which shows superconductivity, what is the oxidation state of cu? Assume the rare earth element yttrium is in its usual +3 oxidation state.

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