Answer:
At the gaseous phase the intermolecular force of attraction between atoms becomes far apart. The atoms can easily be added up with an electron or electrons can be removed from an atom.
Higher energy is required in this process.
Explanation:
Why do scientists use atoms in the gas phase to measure ionization energies and electron affinities
Electron Affinity is where there is a change in energy when electron is added to atom in its gaseous phase. The atom becomes negatively charged.
Ionization Energy is defined as the energy required to remove an electron from gaseous atom.
At the gaseous phase the intermolecular force of attraction between atoms becomes far apart. The atoms can easily be added up with an electron or electrons can be removed from an atom.
