Question
Which of the following has the lowest ionization
enthalpy?Solution
Ionization enthalpy is the energy required to remove the outermost electron from a neutral atom in the gaseous state. Among the given elements: Potassium has the largest atomic size and loosely held outermost electron due to being in the 4th period, making it the easiest to ionize. Hence, it has the lowest ionization enthalpy among the options.
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