Periodic refers to something that does what?
falls
dies
fail
repeat
Mendeleev’s table of the elements is called a periodic table because of its repeating pattern. Anything that keeps repeating is referred to as periodic. Other examples of things that are periodic include the monthly phases of the moon and the daily cycle of night and day. The term period refers to the interval between repetitions. In a periodic table, the periods are the rows of the table. In Mendeleev’s table, each period contains eight elements, and then the pattern repeats in the next row.