What are periods in a periodic table?
Think of periods as the rows in the periodic table—they show the energy levels or shells that the electrons occupy. So, when you see Period 3, cue the three energy levels!
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OMG, periods are just the rows! They indicate the number of electron shells. Easy peasy!
Periods in the periodic table are the horizontal rows, and they tell you how many electron shells an atom of the element has. For example, elements in Period 2 have two electron shells. Simple, right?
Periods = horizontal rows. Done.
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