The elements are listed in the order of how many atoms they have.
For example, hydrogen is the first element on the periodic table. Hydrogen is the smallest element, and has one atom.
rows are called periods columns are known as groups
The rows in the periodic table are called periods. There are 7 periods in periodic table.
Periods have same shells. There are 7 periods in periodic table.
rows. the vertical columns are called periods
Horizontal rows are called periods. There are 7 periods in periodic table.
from 1 to 7
rows are called periods columns are known as groups
The rows in the periodic table are called periods. There are 7 periods in periodic table.
Periods have same shells. There are 7 periods in periodic table.
The periodic table has 7 periods on it.
rows. the vertical columns are called periods
The horizontal rows on the periodic table are periods.
The modern periodic table has seven periods.
The horizontal rows of the periodic table are called Periods and the vertical rows are called groups.
Periods are horizontal rows. 7 periods are present in modern periodic table.
The horizontal rows are referred as periods. There are 7 periods in periodic table.
7The periodic table has 7 periods and 18 groups.