What are the important features of the elements in a period?
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Elements are arranged in the increasing order of atomic numbers. Elements in the modern periodic table are arranged in 7 periods and 18 groups. Horizontal rows are called periods and vertical columns are called groups. Elements are placed in periods based on the number of shells in their atoms.
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elements are arranged in the increasing order to atomic number. elements in the modern period table are arranged in 7 periods and 18 group.
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