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The first ionization energy is lower than the second ionization energy which is lower than third ionization energy.
The reason for the increasing trend is, for the first ionization energy, the number of electrons and protons is equal, making it easier to break their electrostatic force of attraction.
For the second ionization energy, the electrons are less one, meaning thy experience greater attraction by the protons hence a higher energy is required to break the attraction.
For the third ionization energy, the electrons are now less two, they keep experiencing greater attraction to the nucleus meaning higher energy is required to break the force of attraction
Bencele answered the question on August 5, 2019 at 19:09
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