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How to sign: 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
Similiar / Same: element
Within this category: allotrope, transuranic element, noble gas, metallic element, nonmetal, transactinide, actinium, argon, 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, trace element