Which statement is true about ionization energy? a) It is the amount of energy required or released to add a mole of electrons to a mole of atoms of an element in the gas state. b) It is the amount of energy released when removing a mole of electrons from a mole of atoms of an element in the gas state. c) Ionization energies are positive for main group metals and negative for main group nonmetals. d) Ionization energies for main group elements go from positive to negative values when moving down in the same group on the periodic table.

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