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Which of the following electronic configuration of an atom has the lowest ionisation enthalpy?

1. 1s22s22p1
2. 1s22s22p3
3. 1s22s22p63s1
4. 1s22s22p6

Correct answer: 1s22s22p63s1

Solution

The configuration 1s22s22p63s1 corresponds to an alkali metal (e.g., sodium), which has a single electron in its outermost shell. This electron is easily removed, resulting in the lowest ionization enthalpy among the options.

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