The atomic number of an element is based on the number of:

Focal areas, better than the term focal point since it is more of an area than a specific point, by
necessity should be the most dominant part of a composition or a design. A focal area is the part of the
design with the highest concentration of elements. Focal areas bring emphasis to a portion of the
design. They help the eyes and brain focus on what should be the first thing a viewer sees in a design.
The eye will naturally distinguish the focal area at first, if it is well-designed. From the focal area, the
eye should be able to easily follow lines within the design, yet just as easily return back to the focal
area. Emphasis allows a designer to create eye-catching interest within a design or within an
environment.