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(B) The first ionization enthalpy is the energy required to remove the most loosely bound electron from an isolated gaseous atom.Noble gases,such as $

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$He$

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(B) The first ionization enthalpy is the energy required to remove the most loosely bound electron from an isolated gaseous atom.Noble gases,such as $He$,have a completely filled valence shell ($1s^2$ for $He$),which makes them exceptionally stable.Due to this stable electronic configuration and high effective nuclear charge,removing an electron from $He$ requires the highest amount of energy compared to the other elements listed ($Be$,$Li$,$Fe$).

Which of the following elements has the highest first ionization enthalpy?

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