Word Count : 219

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The potential energy of the Neon crystal is given by [ U(r) = -4 \varepsilon \left[ \left( \frac{\rho_0}{r} \right)^6 - \left( \frac{\rho_0}{r} \right)^{12} \right]. ] To find the equilibrium separation (r_0), we set the derivative of (U(r)) with respect to (r) equal to zero: [ \frac{dU}{dr} = 0. ] Differentiating: [ \frac{dU}{dr} = -4 __________ _________ __________ _____ _______ ____ _____ __________ _______ __________ _________.
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