The element X in Period 3 of the periodic table, based on the provided successive ionization energies of 1800, 3000, 3600, 5800, and 13200 kJ/mol, is identified as sulfur (S). The significant jump in ionization energy between the fourth and fifth ionization energies indicates the removal of an electron from a new, more stable electron shell. This pattern of ionization energies is characteristic of nonmetals, specifically sulfur, which has six valence electrons.
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