The Periodic Table contains seven rows of elements. The lanthanide series belongs to row six as elements 57-71. The actinide series belongs to row seven as elements 89-103.
The rows (Horizontal) are called Periods and the Columms (Vertical) are called Groups.
groups
The horizontal rows are named 'PERIODS'. The vertical columns are named 'GROUPS'.
number of protons
7The periodic table has 7 periods and 18 groups.
There are 7 periods in the modern periodic table.
The periodic table has 7 rows and 32 columns.
The rows in the periodic table are called periods. There are 7 periods in periodic table.
There are NO vertical ROWS, because rows run horizontally, and COLUMNS run vertically. There are 18 vertical columns in the periodic table.
rows. the vertical columns are called periods
Horizontal rows are termed as periods. There are 7 periods in periodic table.
Periods are the horizontal rows in the periodic table of Mendeleev; this table contain 7 periods.
They are the horizontal rows in the periodic table
The horizontal rows on the periodic table are called periods.
18 groups
The horizontal rows are periods on periodic table. There are 7 horizontal rows in modern periodic table.
Horizontal rows on the Periodic Table of Chemical Elements are called periods.