atom

1. (physics and chemistry) the smallest component of an element having the chemical properties of the element (synset 114643403)
   referred to in:

   • chemical science, chemistry - the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions
   • natural philosophy, physics - the science of matter and energy and their interactions
   is a type of: substance - the real physical matter of which a person or thing consists
   subtypes:

   • isotope - one of two or more atoms with the same atomic number but with different numbers of neutrons
   • monad - (chemistry) an atom having a valence of one
   • carbon atom - an atom of carbon
   • hydrogen atom - an atom of hydrogen
   • free radical, radical - an atom or group of atoms with at least one unpaired electron; in the body it is usually an oxygen molecule that has lost an electron and will stabilize itself by stealing an electron from a nearby molecule
   has:

   • elementary particle, fundamental particle - (physics) a particle that is less complex than an atom; regarded as constituents of all matter
   • nucleus - the positively charged dense center of an atom
   is a part of:

   • chemical element, element - any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter
   • molecule - (physics and chemistry) the simplest structural unit of an element or compound
2. (nontechnical usage) a tiny piece of anything (synset 114609699)
   is a type of: material, stuff - the tangible substance that goes into the makeup of a physical object
   subtypes:

   • grain - a relatively small granular particle of a substance
   • grinding - material resulting from the process of grinding
   • chylomicron - a microscopic particle of triglycerides produced in the intestines during digestion; in the bloodstream they release their fatty acids into the blood
   • flyspeck - a tiny dark speck made by the excrement of a fly
   • identification particle - a tiny particle of material that can be added to a product to indicate the source of manufacture
   same as: corpuscle, molecule, mote, particle, speck

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