The rows (periods) work out to be the energy levels, ex. if an element is in period 5, it has 5 energy levels.
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.
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.
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.