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Question
Arrange the following elements in the increasing order of their first ionisation energy.
Arrange the following elements in the increasing order of their first ionisation energy.
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Solution
The given elements belong to the first group of the periodic table.
The atomic size increases from Li to Cs (across the group). As a result, the effective nuclear charge on the outermost electron decreases and hence, the ease of removal increases.
The correct order of first ionisation energy would be:
Cs < K < Na < Li
The atomic size increases from Li to Cs (across the group). As a result, the effective nuclear charge on the outermost electron decreases and hence, the ease of removal increases.
The correct order of first ionisation energy would be:
Cs < K < Na < Li
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