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Explain why the first ionisation energy of barium is less than the first ionisation energy of calcium.

Barium is in the sixth period, Calcium is in the fourth. Therefore, Barium experiences more shielding, resulting in weaker attraction of the nucleus for outermost electrons.

Answered by Joseph F. • Chemistry tutor

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Explain why the first ionisation energy of barium is less than the first ionisation energy of calcium.

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