The second and third periods have __elements are called _ periods.

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Solution

Second and third periods contains 8 elements (atomic number 3-10, in the second period, and atomic number 11-18 in the third period).
Therefore, the second and third periods have 8 elements are called short periods.

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The second and third periods have ____________elements are called ___________ periods.

Second and third periods contains 8 elements (atomic number 3-10, in the second period, and atomic number 11-18 in the third period).Therefore, the second and third periods have 8 elements are called short periods.

The second and third periods have __elements are called _ periods.

Second and third periods contains 8 elements (atomic number 3-10, in the second period, and atomic number 11-18 in the third period).
Therefore, the second and third periods have 8 elements are called short periods.