A chart of the elements showing the repeating pattern of their properties.

• A. Periodic Table
• B. groundwater
• C. open water
• D. atoms

Answer: (A)

Elements show repeating patterns in their properties as you move across rows and down columns. The chart that captures this is the periodic table, which arranges elements in order of increasing atomic number and groups them so that elements with similar electron configurations appear in the same columns. This layout makes the repeating trends clear—elements in the same group behave similarly, while properties change gradually across a period and then recur in the next. Groundwater and open water aren’t related to organizing elements by their properties, and atoms are the basic building blocks themselves, not a chart that displays these repeating patterns.