What is the definition of ionization energy for an atom?

  • A
    The energy required to remove an electron from the outermost shell of an isolated gaseous atom in its ground state.
  • B
    The energy released when an electron is added to an isolated gaseous atom.
  • C
    The energy required to excite an electron from the ground state to an excited state.
  • D
    The energy change when an atom gains a proton.

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