Chemistry
What are periods in a periodic table. What is meant by 'period number'. What does it signify.
Periodic Table
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Answer
Periods in the periodic table are the seven horizontal rows of elements arranged in increasing order of their atomic numbers.
Period number is the number assigned to each period i.e., 1, 2, 3, 4, 5, 6 or 7. It signifies the number of shells present in the atom of the element belonging to that period.
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