Multiple choice

Among the following properties, which can be determined in gaseous state only?

  1. The ionisation energy

  2. The electron affinity

  3. Electronegativity

  4. The atomic radius
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B Correct answer
Explanation

The electron affinity of a molecule or atom is the energy change when an electron is added to the neutral atom to form a negative ion. This property can only be measured in an atom in gaseous state.

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