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Atomic weight of all elements download
The elemenents of the periodic table sorted by atomic mass. table sorted by atomic mass. click on any element's name for further information on chemical properties, environmental data or health effects. For chemistry students and teachers: The tabular chart on the right is arranged by Atomic mass (weight). The lightest. The abundances of different isotopes of elements vary in nature depending on the source of materials. For relative abundances of isotopes in nature see reference on Atomic Weights and Isotopic Compositions. Atomic weight: Atomic weight values represent weighted average of the masses of all naturally occurring isotopes. Notes on the Atomic Weight of particular elements: Technetium: Atomic mass number given for longest lived isotope. Promethium: Atomic mass number given for longest lived isotope. Polonium: Atomic mass number given for longest lived isotope. Astatine: Atomic mass number given for longest lived isotope. Radon: Atomic.
TABLE OF ELEMENTS AND THEIR ATOMIC WEIGHTS. APP Atomic. Atomic . Atomic. Atomic. Element. Symbol. Number. Weight. Element. Symbol. Number. Weight. Actinium. Ac. *. Aluminum. Al. Americium. Am. *. Antimony. Sb. Argon. Ar. Arsenic. As . The standard atomic weights of twelve elements having two or more stable isotopes have variability of atomic-weight values in natural terrestrial materials. . Range in isotopic composition of normal terrestrial material prevents a more precise value being given; the tabulated value should be applicable to any normal. Element, Symbol, Z, Atomic Weight, c. Actinium, Ac, 89, (), Aluminium, Al, 13, , Aluminum, Al, 13, , Americium, Am, 95, (), Antimony, Sb, 51, , Argon, Ar, 18, Arsenic, As, 33, , Astatine, At, 85, (), Barium, Ba, 56, , Berkelium, Bk, 97, () .
Atomic weight, also called relative atomic mass, ratio of the average mass of a chemical element's atoms to some standard. Since the standard unit of atomic mass has been one-twelfth the mass of an atom of the isotope carbon An isotope is one of two or more species of atoms of the same chemical element that. Isotope · Relative Atomic Mass · Isotopic · Composition · Standard Atomic Weight · Notes. 1, H, 1, 23(9), (70), [ 84, 11], m. D, 2, 12(12), (70). T, 3, (24). 2, He, 3, (25), 34(3), (2), g,r. 4, 13(6),