Ionization energy is the energy required to remove an electron from a gaseous atom or ion.
The trend of the ionization energies of the elements can be observed in the periodic table:
• increases going from left to right of a period
Place the following in order of increasing first ionizaion energy.
Cs, Mg, Ar
A) Mg < Cs < Ar (highest)
B) Mg < Ar < Cs (highest)
C) Cs < Mg < Ar (highest)
D) Ar < Mg < Cs (highest)
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