The columns in this table indicate that the elements in a particular row are all part of a family of elements sharing certain similarities.
The horizontal rows denote the orbital letter (the highest one) in which all elements have in common.
The horizontal rows are called periods
each row in the Periodic Table is called a period.
These are called periods. Although some chemists simply call them rows.
Groups.
Periods are the horizontal rows in the periodic table of Mendeleev; this table contain 7 periods.
period
Period.
horizontal rows
Period
The horizontal rows on the Periodic Table are called periods, while the vertical columns are called groups or families. For instance, iodine is in the same group, but different period to fluorine, chlorine and bromine.
The second period. (Rows)
The rows are also called periods.
The horizontal rows are called periods
each row in the Periodic Table is called a period.
The horizontal rows are periods.
The horizontal rows of the periodic table are called Periods and the vertical rows are called groups.
The 7 horizontal rows in the periodic table are called periods.