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The elements that are placed outside of the periodic table are called transactinides. These elements are usually placed in a separate row below the main table and are synthetic elements that do not occur naturally on Earth.
A horizontal row on the periodic table of elements is called a period.
Helium is in Group 18 (also known as the noble gases) and in the top row of the periodic table.
This is where the name of the table comes from. A horizontal row of elements is called a period. A vertical column is a group.
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a horizontal row is called a period.a vertical row is called a group
A row in the periodic table is called a period. Columns are groups.
A row in the Periodic Table is called a period. Columns are groups.
A row in the Periodic Table is called a period. Columns are groups.
The elements that are placed outside of the periodic table are called transactinides. These elements are usually placed in a separate row below the main table and are synthetic elements that do not occur naturally on Earth.
In the top row or the first row.
The horizontal row on the periodic table is called the "period". The vertical column is called the "group".
a horizontal row is called a period.a vertical row is called a group
groupsi
A horizontal row on the periodic table of elements is called a period.
A period is a row of elements on the periodic table.