The fourth and fifth periods have __elements and are called _period.

eighteen

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long

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Solution

Fourth and fifth element contains eighteen elements each.
Therefore, The fourth and fifth periods have eighteen elements and are called long period.

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The fourth and fifth periods have ________elements and are called _______period.

Fourth and fifth element contains eighteen elements each.Therefore, The fourth and fifth periods have eighteen elements and are called long period.

The fourth and fifth periods have __elements and are called _period.

Fourth and fifth element contains eighteen elements each.
Therefore, The fourth and fifth periods have eighteen elements and are called long period.