#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
supertype: substance__matter that which has mass and occupies space; "an atom is the smallest indivisible unit of matter"
subtype: actinoid allotrope transuranic_element noble_gas rare_earth metallic_element nonmetal transactinide actinium arsenic astatine boron bromine carbon chlorine fluorine germanium helium hydrogen iodine krypton lawrencium mendelevium neon nitrogen nobelium oxygen phosphorus plutonium radon rutherfordium selenium silicon sulfur tellurium unnilhexium unnilquintium unnilseptium xenon halogen trace_element
part: atom (physics and chemistry) the smallest component of an element having the chemical properties of the element
part: elementary_particle__fundamental_particle__fundamentalparticle__subatomicparticle a particle that is less complex than an atom; regarded as constituents of all matter
part: nucleus__nucleu the positively charged dense center of an atom
part: nucleon a constituent (proton or neutron) of an atomic nucleus
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