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Question
Name the element with the lowest first ionization potential.
Name the element with the lowest first ionization potential.
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Solution
The correct option is E Astatine
On moving down the halogen group, the number of electron shells increases. With increase in the distance between valence electrons and nucleus, less energy is required to remove valence electrons as they are less tightly held to the nucleus. Hence, ionization energy decreases on moving down the group (At < I < Br < Cl < F).
On moving down the halogen group, the number of electron shells increases. With increase in the distance between valence electrons and nucleus, less energy is required to remove valence electrons as they are less tightly held to the nucleus. Hence, ionization energy decreases on moving down the group (At < I < Br < Cl < F).
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