What elements are not found in earth?

star_gazer

Discovery of two new "superheavy" elements has been announced by scientists at the U.S. Department of Energy's Lawrence Berkeley National Laboratory. Element 118 and its immediate decay product, element 116, were discovered at Berkeley Lab's 88-Inch Cyclotron by bombarding targets of lead with an intense beam of high-energy krypton ions. Although both new elements almost instantly decay into other elements, the sequence of decay events is consistent with theories that have long predicted an "island of stability" for nuclei with approximately 114 protons and 184 neutrons. http://www.lbl.gov/Science-Articles/Archive/elements-116-118.html Mar 16 10, 9:17 PM

Zbeckabee

As of 2010, there are 118 known elements (in this context, "known" means observed well enough, even from just a few decay products, to have been differentiated from any other element). Of these 118 elements, 94 occur naturally on Earth. Six of these occur in extreme trace quantities: technetium, atomic number 43; promethium, number 61; astatine, number 85; francium, number 87; neptunium, number 93; and plutonium, number 94. These 94 elements, and also possibly element 98 californium, have been detected in the universe at large, in the spectra of stars and also supernovae, where short-lived radioactive elements are newly being made. The remaining 22 elements, not found on Earth or in astronomical spectra, have been derived artificially. http://en.wikipedia.org/wiki/Chemical_element Even though there are 92 elements that are naturally found, only eight of them are common in the rocks that make up the Earth’s outer layer, the crust. Together, these 8 elements make up more than 98% of the crust. The 8 most common elements in Earth’s crust (by mass): 46.6% Oxygen (O) 27.7% Silicon (Si) 8.1% Aluminum (Al) 5.0% Iron (Fe) 3.6% Calcium (Ca) 2.8% Sodium (Na) 2.6% Potassium (K) 2.1% Magnesium (Mg) http://www.windows.ucar.edu/tour/link=/earth/geology/crust_elements.html Mar 16 10, 9:49 PM

satguru

I will add something I only discovered recently. They think many post-uranic elements were originally natural but as they decay all wore out to lower elements long before man studied them. http://www.daviddarling.info/encyclopedia/R/radioactive_series.html Mar 17 10, 10:13 AM