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Step 1I'll explain the significance of periods in the periodic table:
Step 2: Definition of Periods
Periods are horizontal rows in the periodic table that represent the number of electron shells in an atom of that element. Each period corresponds to a new electron energy level being filled.
Final Answer
Periods in the periodic table represent the number of electron shells in an atom, showing how electrons are progressively added to higher energy levels as atomic number increases, which fundamentally determines an element's chemical and physical properties.
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