The same number of energy levels
A row on the periodic table is a horizontal arrangement of elements that share similar properties. These elements have the same number of electron shells. Each row represents one energy level or electron shell in an atom.
period
A horizontal row in the periodic table is called a period. There are seven periods in the periodic table, labeled from 1 to 7. Each period represents the energy levels of the elements within that row.
Each horizontal row in the periodic table is called a period.
Period
each row in the Periodic Table is called a period.
An elements period is its row in the Periodic Table.
An elements period is its row in the Periodic Table.
Each row on the periodic table is called a period, while each column is called a group.
An elements period is its row in the periodic table.
Those are columns.
Each (horizontal) row is called a '''period''', whereas each (vertical) column is called a group.