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a) The inert gases have very high ionization energy, due to the stability of the outer shell. Helium has the highest ionization energy.
b) Within a group, the ionization energy generally decreases with increasing atomic number. Increasing atomic number results in increasing atomic radii. Thus, the electrons of the outer shell are further away than those of the previous element and can be removed easily.
Githiari answered the question on October 14, 2017 at 00:19
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