Final answer:
The periodic trend is the way properties repeat in a regular way as atomic numbers increase.
Step-by-step explanation:
The way properties repeat in a regular way as the atomic numbers increase is called the periodic trend. This trend is a fundamental concept in chemistry and is represented by the periodic table. As you move across a period (row) in the periodic table, the properties of the elements periodically repeat. For example, elements in the same group (column) of the periodic table tend to have similar chemical properties. This repeating pattern helps in predicting the behavior of elements based on their position in the periodic table.