Atomic mass of Bromine is 79.904 u. The atomic mass is the mass of an atom. The atomic mass or relative isotopic mass refers to the mass of a single particle, and therefore is tied to a certain specific isotope of an element. The atomic mass is carried by the atomic nucleus, which occupies only about 10 -12 of the total volume of the atom or Atomic mass of Hydrogen is 1.0079 u. The atomic mass is the mass of an atom. The atomic mass or relative isotopic mass refers to the mass of a single particle, and therefore is tied to a certain specific isotope of an element. The atomic mass is carried by the atomic nucleus, which occupies only about 10 -12 of the total volume of the atom or For the full article, see atomic weight . atomic weight, Ratio of the average mass of a chemical element ’s atoms to 1/12 the mass of an atom of the carbon-12 isotope. The original standard of atomic weight, established in the 19th century, was hydrogen, with a value of 1. From c. 1900 until 1961, the reference standard was oxygen, with a 2 days ago · The atomic weight of an atom is a dimensionless number when it is isolated by bound together atomic weight or Daltons. This is known as the total isotopic mass. The atomic masses of elements change from 1.008 amu for hydrogen up to 250 amu for elements that have an extremely high atomic number. Atomic mass of Xenon is 131.293 u. The atomic mass is the mass of an atom. The atomic mass or relative isotopic mass refers to the mass of a single particle, and therefore is tied to a certain specific isotope of an element. The atomic mass is carried by the atomic nucleus, which occupies only about 10 -12 of the total volume of the atom or The atomic weight of an atom is a dimensionless number when it is divided by unified atomic weight or Daltons. This is called the relative isotopic mass. The atomic masses of elements vary from 1.008 amu for hydrogen up to 250 amu for elements which have a very high atomic number. The atomic weight, molecular weight, or formula weight of one mole of the fundamental units (atoms, molecules, or groups of atoms that correspond to the formula of a pure substance) is the ratio of its mass to 1/12 the mass of one mole of C 12 atoms, and being a ratio, is dimensionless. The atomic mass is usually measured in the units unified atomic mass unit (u), or dalton (Da). Both units are derived from the carbon-12 isotope, as 12 u is the exact atomic mass of that isotope. So 1 u is 1/12 of the mass of a carbon-12 isotope: 1 u = 1 Da = m(12 C)/12 1 AMU or 1 u is 1 atomic mass unit. 1 atomic mass unit is equal to the mass of 1 proton or 1 neutron. An atomic mass unit is defined as 1/12 the mass of a carbon-12 atom. A carbon-12 atom has 6 Atomic Mass is an extremely important concept in Chemistry. But how is it exactly Measured? Are all the Subatomic Particles considered while measuring Atomic mK4It.