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
Of the choices below, which gives the order for first ionization energies?
a. Al > Si > S > Cl > Ar
b. S > Si > Cl > Al > Ar
c. Cl > S > Al > Ar > Si
d. Cl > S > Al > Si > Ar
e. Ar > Cl > S > Si > Al
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