I What is the Meaning of the Fermi Energy?

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Fermi energy (Ef) represents the energy of the highest occupied level in a ground state N electron system. In the ground state, which corresponds to the n=1 level, only one orbital is available, accommodating a maximum of two electrons. This implies that the Fermi energy reflects the energy of one of these two electrons in the n=1 state. The discussion highlights that the ground state configuration is specifically applicable to hydrogen and helium. Understanding Fermi energy is crucial for grasping the electronic structure of these simple atoms.
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Is fermi energy is the energy of one of the two electrons located in the state n=1?
The Fermi energy Ef is defined as the energy of the topmost filled level in the ground state of the N electron system. Ground state is n=1 level. And in the ground state there can be only one orbital right? One orbital can have only up to 2 electrons. Does this mean that fermy energy is the energy of one of the two electrons located in this orbital (in n=1 state)?
 
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The ground state is only n=1 for hydrogen and helium
 

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