What is the term for the chart that organizes all known elements by properties?

• A. Element
• B. Pure substance
• C. Periodic table
• D. Compound

Answer: (C)

The periodic table is the chart that organizes all known elements by properties. Elements are arranged in order of increasing atomic number in rows called periods, and in columns called groups that reflect similar chemical behavior. This layout shows repeating patterns in properties, so you can predict how elements will act and react based on their position—like alkali metals in the first group or noble gases in the far-right column. It also highlights trends such as how reactivity or metallic character changes across a period and down a group. An element is a basic substance that cannot be broken down into simpler substances by ordinary means; a pure substance is matter with a fixed composition, and a compound is a substance formed from two or more elements chemically bonded. Only the periodic table serves as the chart organizing elements by properties.