All of the elements in a given horizontal row (or period) have the energy level, but they differ in the number of valence electrons.
The horizontal rows in the periodic table are called periods.
The horizontal rows are periods on periodic table. There are 7 horizontal rows in modern periodic table.
The horizontal rows are called periods
The horizontal rows on the periodic table are called periods.
rows. the vertical columns are called periods
The two names for horizontal rows on the periodic table are periods and series.
The horizontal rows on the periodic table are called periods.
The horizontal rows on the periodic table are called periods.
they are both very straight lines, and they both make rows, and together, they make a marvelous grid
These horizontal rows are called periods.
The horizontal rows are periods on periodic table. There are 7 horizontal rows in modern periodic table.
The horizontal rows of elements in the periodic table are called periods.
The horizontal rows on the periodic table are called periods.
The horizontal rows are called periods
Rows
The rows (Horizontal) are called Periods and the Columms (Vertical) are called Groups.
rows. the vertical columns are called periods
Horizontal rows are called groups. Groups are formed according to the atomic number.