20. For which of the following elements is the ionization energy of a neutral atom the lowest? (Z is the atomic number.)
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20. For which of the following elements is the ionization energy of a neutral atom the lowest? (Z is the atomic number.)
20. For which of the following elements is the ionization energy of a neutral atom the lowest? (Z is the atomic number.) (A) Oxygen (Z= 8) (B) Fluorine (Z = 9) (C) Neon (Z = 10) (D) Sodium (Z = 11) (E) Magnesium (Z = 12)
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