What is a Period on the Periodic Table?
A period on the periodic table is a horizontal row of elements. Each period signifies a new principal energy level for the electrons of the atoms.
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It's one of the horizontal rows that stretch from left to right. As you go across a period, atomic numbers increase, and properties change progressively.
It's basically a row that runs left to right. Simple as that!
Periods are the horizontal rows. With each row you move down, the atomic number (and energy level) of the elements increase.
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