1. Atomic size: In small atoms electrons remains closer to nucleus and they feel more nuclear attraction. So more ionization energy is required to remove electron from small atoms. While in big sized atoms, valence electrons are away from nucleus , so they experience less nuclear attraction. Hence it requires less ionization energy to remove electrons from big atoms.
Therefore, Ionization energy is inversely proportional to Atomic size.
Jan 1st, 2015
Did you know? You can earn $20 for every friend you invite to Studypool!