This is so, because these rows separate f-block of the elements from other blocks.
The two rows of elements placed below the periodic table are known as f block elements. The two rows are also known as lanthanides and actinides. In these elements, the electrons are filled in the antepenaltimate f orbital.
The horizontal rows are periods on periodic table. There are 7 horizontal rows in modern periodic table.
A period is a row in the periodic table of elements.
The rows on the periodic table are called periods.
rows
The two rows of elements placed below the periodic table are known as f block elements. The two rows are also known as lanthanides and actinides. In these elements, the electrons are filled in the antepenaltimate f orbital.
The horizontal rows of elements in the periodic table are called periods.
The Periods are the horizontal rows on the periodic table.
Horizontal rows in Periodic Table are called Periods
Horizontal rows on the Periodic Table of Chemical Elements are called periods.
The horizontal rows are periods on periodic table. There are 7 horizontal rows in modern periodic table.
in the periodic table the rows are called periods and the columns are called groups
A period is a row in the periodic table of elements.
The rows on the periodic table are called periods.
horizontal rows of elements
rows
A period is a row of elements on the periodic table.