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How many repulsive Coulombic (electron-electron) energy terms would be found in the Hamiltonian for the carbon...

How many repulsive Coulombic (electron-electron) energy terms would be found in the Hamiltonian for the carbon atom​? And Why?

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Answer #1

Carbon atom has 6 electrons.

Repulsive energy is in between 2 electrons

=> total no.of energy terms 6C2 = 15

For explanation take the example of He

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