Primordial elements are chemical elements found on the earth that have existed in their current form since before the earth was formed, according to the big bang theory. This means that the half-life on the given atoms must be greater than about 4.5×10⁹ years. The mass of the atom is also very important. Heavier atoms would need longer half lives to be primordial because lighter elements are formed more often in stellar reactions. A chemical element, often called simply element, is a chemical substance that cannot be divided or changed into other chemical substances by any ordinary chemical technique. ... According to the Big Bang theory, the universe originated in an infinitely dense and physically paradoxical singularity. ... Half-Life For a quantity subject to exponential decay, the half-life is the time required for the quantity to fall to half of its initial value. ... The Pleiades star cluster A star is a massive body of plasma in outer space that is currently producing or has produced energy through nuclear fusion. ...

Hydrogen, helium (both helium-3 and helium-4), most deuterium, and some lithium-7 are examples of primordial elements, but tritium is not. All stable isotopes are primordial, as are some radioactive isotopes including thorium-232, uranium-235, uranium-238, potassium-40, and rubidium-87. It has also been shown that plutonium-244 is a primorial isotope, although just barely as its concentration in ores is nearly undetectable. General Name, Symbol, Number hydrogen, H, 1 Chemical series nonmetals Group, Period, Block 1, 1, s Appearance colorless Atomic mass 1. ... General Name, Symbol, Number helium, He, 2 Chemical series noble gases Group, Period, Block 18, 1, s Appearance colorless Atomic mass 4. ... Deuterium, also called heavy hydrogen, is a stable isotope of hydrogen with a natural abundance of one atom in 6500 of hydrogen. ... General Name, Symbol, Number Lithium, Li, 3 Series Alkali metal Group, Period, Block 1(IA), 2, s Density, Hardness 535 kg/m3, 0. ... Tritium (symbol T or 3H) is a radioactive isotope of hydrogen. ... Radioactive decay is the set of various processes by which unstable atomic nuclei (nuclides) emit subatomic particles. ... General Name, Symbol, Number thorium, Th, 90 Chemical series Actinides Group, Period, Block n/a, 7, f Appearance silvery white Atomic mass 232. ... Uranium-235 is an isotope of uranium that differs from the elements other common isotope, uranium-238, by its ability to cause a rapidly expanding fission chain reaction. ... There are two objects with this name: Unterseeboot 238 Uranium-238, the most common isotope of uranium This is a disambiguation page — a navigational aid which lists other pages that might otherwise share the same title. ... General Name, Symbol, Number potassium, K, 19 Chemical series alkali metals Group, Period, Block 1, 4, s Appearance silvery white Atomic mass 39. ... General Name, Symbol, Number rubidium, Rb, 37 Chemical series alkali metals Group, Period, Block 1, 5, s Appearance grey white Atomic mass 85. ... General Name, Symbol, Number plutonium, Pu, 94 Chemical series actinides Group, Period, Block n/a, 7, f Appearance silvery white Atomic mass (244) g/mol Electron configuration [Rn] 5f6 7s2 Electrons per shell 2, 8, 18, 32, 24, 8, 2 Physical properties Phase solid Density (near r. ...

Greeks

Main article: Classical element

According to Greek philosophy, the primordial elements, also know as the base elements, are the four infinite substances. These substances, Water, Fire, Earth and Air, were believed to make up everything in existence. Chinese Wood (木) | Fire (火) | Earth (土) | Metal (金) | Water (水) Hinduism The Panchamahabhuta (five great elements) Prithvi/Bhumi (Earth) Ap/Jala (Water) Agni/Tejas (Fire) Vayu/Pavan (Air/Wind) Akasha (Aether) Many ancient philosophies used a set of archetypal classical elements to explain patterns in nature. ...