Physics:
* Matter: Atoms are the fundamental building blocks of matter.
* Chemistry: Atoms are the basis of chemical elements and compounds.
* Nuclear Physics: The nucleus of an atom is the focus of nuclear physics.
* Quantum Mechanics: The behavior of atoms is governed by the principles of quantum mechanics.
* Subatomic Particles: Atoms are composed of protons, neutrons, and electrons.
Other relevant entries:
* Element: Atoms are the smallest unit of an element.
* Molecule: Molecules are formed by the bonding of multiple atoms.
* Periodic Table: The periodic table organizes elements based on their atomic structure.
Tips for finding information on atoms:
* Use the encyclopedia's index: Most encyclopedias have a detailed index that lists entries by keyword. Look under "atom," "atomic," "elements," "matter," or "chemistry."
* Browse related categories: Many encyclopedias organize information into categories. Look for categories related to physics, chemistry, or matter.
* Use online search tools: If you are using an online encyclopedia, use the search bar to find information about atoms.
Remember that the best cross-reference for "atom" will depend on the specific encyclopedia and the level of detail you are seeking.