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- 1 decade agoFavorite Answer
NEON in the 2nd period of periodic table has the highest I.E.
1st ionization energy: 2080.6 kJ/mol
2nd ionization energy: 3952.2 kJ/mole
3rd ionization energy: 6121.9 kJ/mole
- Anonymous1 decade ago
In any given row, the Noble Gas at the end will have the highest ionization energy.
- 1 decade ago
i think it's neon because it's the most stable element and hardest to remove electrons from it's shells
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