Word Count : 135

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The complete Hamiltonian for the hydrogen molecule (H₂) is expressed as the sum of kinetic and potential energy terms for all electrons and nuclei. It can be written as: $\hat{H} = -\frac{\hbar^2}{2m_e} (\nabla_1^2 _____ _______ _________ __________ _______ ____ ____.
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