period
Period
The vertical "rows" are called Columns, and the horizontal "rows" are called Periods
They are called f-block elements. The first row elements are called lanthanides. The second row elements are called actinides.
This row of chemical elements is a "period".
Elements in the first row of the rare earth elements of the Periodic Table are called LANTHANIDES.
you may think i am kidding but the horizontally aligned elements are called periods. The vertical is called groups.
row
row or column
litium, and elements in the 2nd period (row) are pretty common
A horizontal row on the periodic table of elements is called a period.
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.
On the Periodic table, horizontal rows are given the technical term "periods", while vertical columns are called "groups". Elements in the same period are similar in that they have the same number of energy levels.