Final answer:
The periodic table is arranged in order of electron configuration, which determines groupings of elements with similar chemical behaviors due to similar valence electron patterns.
Step-by-step explanation:
The question asks which of the following elemental properties is arranged in order on the periodic table: elemental color, electron configuration, chemical symbol, or atomic mass. The correct answer is electron configuration.
The periodic table is primarily arranged by increasing atomic number, but it also reflects the pattern of electron configurations of the elements. Each horizontal row in the periodic table is called a period, and each period signifies a completion of an electron shell when moving across the elements. Additionally, elements are grouped into columns called groups, and elements in the same group share similar electron configurations in their valence shells, accounting for their similar chemical behaviors.