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Question

Electron affinity is defined as ?
  1. the change in energy when a gaseous atom in its ground state gains an electron
  2. the pull an atom has on the electrons in a chemical bond
  3. the energy required to remove a valence electron from a neutral gaseous atom in its ground state
  4. the energy difference between an electron in its ground and excited states
  5. None of the above

A
the energy difference between an electron in its ground and excited states
B
None of the above
C
the change in energy when a gaseous atom in its ground state gains an electron
D
the pull an atom has on the electrons in a chemical bond
E
the energy required to remove a valence electron from a neutral gaseous atom in its ground state
Solution
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Option A is the correct answer.
Electron affinity is defined as the energy given out by an atom, when an electron is added to that atom in its ground state, to form a negative ion.

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