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  4. Which of the following has lowest first ionization energy?

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Q. Which of the following has lowest first ionization energy?

Rajasthan PMTRajasthan PMT 2002Classification of Elements and Periodicity in Properties

Solution:

Ionisation energy increases as we move left to right across a period (i.e., from $Li$ to $Ne$) and decreases when from top to bottom in a group. Hence, ionisation energy of lithium $( Li )$ is lowest in the given elements.