The ionisation energy of elements _________, as we go down the group.

Increases

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Decreases

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Does not vary

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Has no definite variation

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Solution

The correct option is B
Decreases

The ionisation energy of an element is the minimum amount of energy required to remove one or more valence electrons from one mole of that element in the gaseous state.

As one progresses down a group on the periodic table, the ionisation energy will likely decrease since the valence electrons are farther away from the nucleus and experience a weaker attraction to the nucleus's positive charge.

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Similar questions

Ionisation energy increases as we move down the group of a periodic table whereas it decreases as we move from left to right of the periodic table.

Assertion: The metallic character increases as we go down the group.

Reason: Increase in size decreases the ionisation energy.

Assertion: The ionisation energy decreases as we go from left to right in a period.

Reason: The nuclear charge increases as we go from left to right in a period but the number of shells remain the same in a period.

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