For the series of elements X, Y, and Z all in the same period (row), arrange the elements in order of decreasing first ionization energy.
Ionization energy is the energy required to remove an electron from an atom or ion. First ionization energy refers to the energy required to remove an electron from an electrically neutral atom in the gas phase. Subsequent ionization energies reflect the energies needed to strip successive electrons off an increasingly positively charged ion.
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