The first ionization energy of an element is the energy that must be used to remove the outermost electron from an atom in a gaseous state. The energy of the second, third and so on .... ionization energy is used to remove the second, third, etc. .... electron.
The ionization energy is measured in kJ / mol.
is meant to indicate that the energy required to tear an electron to an Avogadro number, 6.022 x 10 23 atoms of that element.
The ionization energy is greater than the electron is more strongly linked to the nucleus and this is natural because to win a high force is necessary to use more energy.
Remember that electrons, negatively charged particles are attracted to the nucleus where it is concentrated all the positive charge and are more attracted to the higher is the number of protons, that is, the greater the positive charge of the nucleus and the more they are close to the nucleus.
So if we imagine an atom to pull all its electrons starting from the outer gradually until the last that remains, it is easy to imagine that the ionization energies increase as you get closer to the nucleus because the electrons will be retained this with ever greater force.
The second ionisation energy is greater than first-ionization.
The second ionization energy is the energy required to tear an electron to an atom, or rather an ion, which had been previously torn.
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