Physics

Copper has a Fermi energy of 7.02 eV. What is its electron number
density?

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Using Ef=h^2/8m(3n/pi)^2/3

I get an answer of 2.246*10^7 but this is incorrect. I know the answer is 1.8*10^29 but am struggling to see where I went wrong. Can anyone help?

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