What is the atomic mass of an element?

The atomic mass (m a) is the mass of an atom. Its unit is the unified atomic mass units (symbol: u, or Da) where 1 unified atomic mass unit is defined as 1 ⁄ 12 of the mass of a single carbon-12 atom, at rest. read more

The atomic mass of an atom will change depending on its amount of protons and neutrons, and will be different for each individual element. Examples of Atomic Mass Hydrogen is the lightest naturally occurring element. read more

As of August 2017, 118 chemical elements are identified.A chemical element or element is a species of atoms having the same number of protons in their atomic nuclei (i.e. the same atomic number, or Z). read more

Chemical elements listed by atomic mass The elemenents of the periodic table sorted by atomic mass. click on any element's name for further information on chemical properties, environmental data or health effects. This list contains the 118 elements of chemistry. read more