Many-electron atoms general energy ordering

While the energy of a one-electron orbital depends only on n, in a many-electron atom the energy of the orbital is determined by both n and /. Thus, an electron in a 2p orbital has higher energy than an electron in a 2s orbital. The order of orbital energies in many-electron atoms is generally as follows ... 

A FIGURE 6.24 General energy ordering of orbitals for a many-electron atom. 

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