period
The horizontal sections of the periodic table are called periods.
The "Periodic Table".
Horizontal rows are called periods. There are 7 periods in periodic table.
The Periodic Table is arranged like it is for a specific reason. It is probably called the Periodic Table because it is made up of "periods" or horizontal rows.
The horizontal rows in a periodic table are called periods. Periods represent the number of energy levels an atom's electrons occupy in an element's electron cloud.
they are called periods, but most people will know if you call them rows
The Communist's Periodic Table of Elements:)Couldn't Resist
Tabulation.
The horizontal rows are called periods. The vertical columns are groups.
Periods
The Periodic Table of Elements
The vertical sections of the periodic table are called groups or columns.