![]() There you can find the metals, semi-conductor(s), non-metal(s), inert noble gas(ses), Halogens, Lanthanoides, Actinoids (rare earth elements) and transition metals. ![]() Please note that the elements do not show their natural relation towards each other as in the Periodic system. The atomic mass (relative isotopic mass) is defined as the mass of a single atom, which can only be one isotope (nuclide) at a time, and is not an abundance-weighted average, as in the case of relative atomic mass/atomic weight. The atomic weight of helium is 4.002602, the average that reflects the typical ratio of natural abundances of its isotopes. The unity for atomic mass is gram per mol. The lightest chemical element is Hydrogen and the heaviest is Hassium. Carbon exists on Earth as about 99 12 C and about 1 13 C, so the weighted average mass of carbon atoms is 12.01 u. The atomic mass of an element is the weighted average of the atomic masses of the naturally occurring isotopes of that element. ![]() Similar average atomic masses can be calculated for other elements. The chemical elements ofįor chemistry students and teachers: The tabular chart on the right is arranged by Atomic mass (weight). The atomic mass of boron would be calculated as (0.199 × 10.0 u) + (0.801 × 11.0 u) 10.8 u. This list contains the 118 elements of chemistry.
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