Atomic
Atomic, molecular, and optical physics is the study of matter-matter and light-matter interactions on the scale of single atoms or structures containing a few atoms. The three areas are grouped together because of their interrelationships, the similarity of methods used, and the commonality of the energy scales that are relevant.
Atomic physics is distinct from nuclear physics, despite their association in the public consciousness. Atomic physics is unconcerned with the nuclear processes studied in nuclear physics, although properties of the nucleus can be important in atomic physics (e.g., hyperfine splitting).
A chess variant is any game derived from or related to chess. In practice, a specific chess variant may be similar to chess or radically different. The broad definition of chess variants is so universal, it may include nearly any abstract battle or war game played upon a board.
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