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The central atom should be the same as for a Lewis structure, in which we choose the atom with the lowest ionization energy to be the center of the structure. The ionization energy is the minimum energy required to remove an electron from an atom. Electronegativity refers to the pulling power of an atom, which grows as ionization energy and electron affinity increase.
Both ionization energy and electronegativity increases as you move up and right of the periodic table. Electronegativity decreases as you go down the group because the increasing number of energy levels cause the outer electrons to be further away from the nucleus. Ionization energy increases as you go up the periodic table because with less energy levels, the nucleus has a stronger pull on the electrons, so it is harder to take.
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