Noun
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
Source: WordNet1. Small particles called atoms exist and compose all matter; 2. They are indivisible and indestructible; 3. Atoms of the same chemical element have the same chemical properties and do not transmute or change into different elements. John Dalton
Alchemical symbol for fire In alchemy the chemical element of sulfur was often associated with fire and its alchemical symbol and its symbol was an upward-pointing triangle. Source: Internet
Click here for more information. main infobox Actinium is a radioactive chemical element with symbol Ac (not to be confused with the abbreviation for an acetyl group ) and atomic number 89, which was discovered in 1899. Source: Internet
Click here for more information. main infobox Thulium is a chemical element with symbol Tm and atomic number 69. It is the thirteenth and antepenultimate (third-last) element in the lanthanide series. Source: Internet
Click here for more information. main infobox Lithium (from Greek λίθος lithos main, "stone") is a chemical element with the symbol Li and atomic number 3. It is a soft, silver-white metal belonging to the alkali metal group of chemical elements. Source: Internet
Click here for more information. main infobox Samarium is a chemical element with symbol Sm and atomic number 62. It is a moderately hard silvery metal that readily oxidizes in air. Source: Internet