Many events are periodic. The seasons and the calendar are periodic. If you have a music lesson every Tuesday after school, it is a
periodic event. Which statement best explains why the table of
elements is periodic?
A.
All elements are included in the table.
B. It has rows and columns, as a calendar does.
C. Properties of the elements repeat in a cycle or repeating
pattern.
D. It has many different parts, each of which is different from
other parts.