ACS Chemistry Practice Exam 2025 – The All-in-One Guide to Exam Success!

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What is the term for the horizontal rows in the periodic table?

Columns

Groups

Periods

The term for the horizontal rows in the periodic table is "periods." Each period corresponds to the highest principal energy level that electrons occupy in the atoms of the elements within that row. As you move from left to right across a period, the atomic number increases, indicating that each subsequent element has one more proton and usually one more electron than the previous element. This arrangement leads to a gradual change in the properties of the elements, which is a fundamental concept in the study of chemistry.

The other terms often associated with the periodic table refer to different aspects: columns are known as groups and represent vertical arrangements where elements share similar chemical properties, while "sections" is not a standard term used in discussing the layout of the periodic table. Understanding these definitions helps in grasping the structure and organization of elements in the table.

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