The number of elements present in the second period
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8 elements
Second and third periods contain 8 elements each and are called as short periods.
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The first period of the periodic table is a short one consisting of only twoelements, hydrogen and helium. Lithium, atomic number 3 begins the second period, which has 8 elements. Elementswith atomic numbers 4-10, which complete this period, are discussed in this section.
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