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The central atom will have to "share" its electrons with the most other atoms. Thus, it should not really "want" to keep those electrons as much. So the atom with the lowest ionization energy will satisfy that requirement.
The central atom is the one with the lowest ionization energy because having lower ionization energy means being more easily able to share/give up electrons rather than holding on to its lone pairs. An element's first ionization energy is simply the energy required to pull off one electron, so intuitively, elements with lower ionization energy commonly have multiple covalent bonds in a molecule while elements with higher ionization energy commonly hold on to their lone pairs rather than having several covalent bonds.
Hydrogen is not the central atom because it only has one bond meaning it can only bond with one atom. Because of this, Hydrogen has to be placed on the atoms towards the outside of the molecule. If Hydrogen is the central atom, there is only one other atom it can bond with but there are molecules that have more than 2 atoms.
Hydrogen cannot be the central atom mainly because it only has one electron, therefore can only form one bond, and when an atom is the central that usually implies that it must be able to form more than one bond. It could be considered as an exception considering it isn't able to bond to as many atoms like other elements.
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