The noble gas with the highest ionization energy is helium. Helium has an atomic number of 2 and a mass of 4.002602 amu. Helium’s first ionization energy is 2372 kJ/mol, making it the element with the highest ionization energy in the periodic table.
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The noble gas with the highest ionization energy is helium. Helium has an atomic number of 2 and a mass of 4.002602 amu. Helium’s first ionization energy is 2372 kJ/mol, making it the element with the highest ionization energy in the periodic table.