In physics, [b]atom[/b] is the most basic form of the chemical elements, primarily consists of a nucleus made of protons and neutrons, and were typically surrounded by electrons.

This tag can be apply to the "basic" visualization of an atom, such as a sphere surrounded by ring(s) with several electrons orbiting around it. Do [b]not[/b] tag atom when the character is simply manifesting a simple energy ball with no distinctive shape (such as [[Reiuji Utsuho]]'s "atomic ball").
原子 げんし アトム 元素 げんそ 単位 たんい