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

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$Kr$

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(D) The first ionization energy is the energy required to remove the most loosely bound electron from an isolated gaseous atom.Noble gases,such as $Kr$ (Krypton),have a stable electronic configuration with a completely filled valence shell $(ns^2 np^6)$.Due to this stable configuration,they have the highest ionization energy in their respective periods.Therefore,$Kr$ has the highest first ionization energy among the given options.

Among the following,which has the highest first ionization energy?

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