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What Is the Formula of the Superconductor Whose Unit Cell

question 102

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What is the formula of the superconductor whose unit cell is shown below?
(The Y and Ba atoms are in the middle of the cell.) What is the formula of the superconductor whose unit cell is shown below? (The Y and Ba atoms are in the middle of the cell.)     A)  YBa<sub>2</sub>Cu<sub>3</sub>O<sub>9 </sub> B)  YBa<sub>2</sub>Cu<sub>4</sub>O<sub>5 </sub> C)  YBa<sub>2</sub>Cu<sub>2</sub>O<sub>7 </sub> D)  YBa<sub>2</sub>Cu<sub>4</sub>O<sub>7 </sub> E)  YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7 </sub>


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