What Are the Rows of the Periodic Table Called?

February 14, 2024

The periodic table organizes all discovered chemical elements into rows (called periods) and columns (called groups). The vertical columns of the modern periodic table are numbered from 1 to 18. Groups are grouped together because they have similar properties. Elements in the same group have their outermost electrons arranged in the same way. This is called their valence shell and it determines how they react with other elements.

There are seven periods in the periodic table. Each period has a different energy level for the electrons in atoms. In the first period, there are two elements - hydrogen and helium. Hydrogen has one electron and helium has two. As you move across a period, the number of electrons in each atomic orbital increases by one. The elements in the first row have all had one orbital for their electrons, and as you move down the row the numbers increase by 1.

Dmitri Mendeleev, who invented the periodic table in the 1860s, was convinced that there was an order to the elements. He collected information on each element and organized it into a table, which he called the periodic table. He left gaps in the table for elements that had not been discovered yet.


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