Answer:
Isolated gaseous atom means a
single gaseous atom free from other atoms. No energy should be utilised to separate
it further from other atoms. It is an ideal situation which is difficult to
achieve. However, the interatomic distances are reduced to minimum by carrying
out the measurement of ionisation enthalpy at a low pressure.
Ground state
means that the atom must be present in the most stable state, i.e., in the
lowest energy state possible for the atom.
These terms are used for comparison purposes.
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