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Question
In a group from top to bottom, ionisation energy _______.
In a group from top to bottom, ionisation energy _______.
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Solution
The correct option is A decreases
As we move down the group the atomic size increases and thus the outermost electron is increasingly loosely bound to the nucleus. Thus less energy is needed to remove it. Hence IE decreases top to bottom in a group.
As we move down the group the atomic size increases and thus the outermost electron is increasingly loosely bound to the nucleus. Thus less energy is needed to remove it. Hence IE decreases top to bottom in a group.
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