# Chemical elements/Related Articles

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A list of Citizendium articles, and planned articles, about Chemical elements.

## Subtopics

• Engineering [r]: a branch of engineering that uses chemistry, biology, physics, and math to solve problems involving fuel, drugs, food, and many other products. [e]
• Biology [r]: The science of life — of complex, self-organizing, information-processing systems living in the past, present or future. [e]
• Earth science [r]: The study of the components and processes of the planet Earth. [e]
• Chemical engineering [r]: a branch of engineering that uses chemistry, biology, physics, and math to solve problems involving fuel, drugs, food, and many other products [e]

## Other related topics

• Allotrope [r]: A structural form of a chemical element, a specific configuration of atoms making up the crystalline structure. [e]
• Atom (science) [r]: The defining unit of chemical elements. [e]
• Atomic number [r]: The number of protons in the nucleus of a single atom of a chemical element. [e]
• Chemical compound [r]: A chemical substance consisting of two or more chemical elements bonded in a fixed ratio; not a mixture. [e]
• Elementary charge [r]: Charge of electron (negative) and proton (positive); before discovery of the quark thought to be the smallest possible electric charge, written ${\displaystyle e}$, value 1.602 176 53(14) × 10−19 C [e]
• Matter [r]: Please do not use this term in your topic list, because there is no single article for it. Please substitute a more precise term. See Matter (disambiguation) for a list of available, more precise, topics. Please add a new usage if needed.
• Molecule [r]: An aggregate of two or more atoms in a definite arrangement held together by chemical bonds. [e]
• Periodic Table of Elements [r]: A tabular method of displaying the chemical elements. [e]
• Proton [r]: A subatomic particle with an electric charge of +1 elementary charge. [e]
• Substance [r]: Add brief definition or description