Why does helium have a higher first ionization energy than hyrogen
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Explanation:
Helium has a structure 1s2. The electron is being removed from the same oribital as an hydrogen's case. It is close to the nucleus and unscreened. The of the ionisation energy (2370KJmol-1) is much higher than hydrogen, because the mucleus now has 2 protons attracting the electrons instead of 1.
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