Atomic mass , often referred to as atomic weight, is a fundamental concept in chemistry and physics. It represents the average mass of atoms in a given chemical element, considering the relative abundance of its isotopes. Atoms, the building blocks of matter, consist of a nucleus containing protons and neutrons, surrounded by a cloud of electrons. The atomic mass is primarily determined by the combined mass of protons and neutrons in the nucleus, as electrons contribute only a negligible amount to the overall mass of an atom.
Also Check - Discovery of Proton Formula
On comparing the mass of electrons with protons and neutrons, one can easily understand that the mass of electrons is significantly less than that of protons and neutrons.Download PDF Atomic Mass Formula
Also Check - Bond Order Formula
Atomic mass(A) = No of protons* Mass of Proton +No of neutrons* Mass of Neutrons +No of electrons* Mass of Electrons = 6*1.007316+6*1.008701+6*0.000549 = 12.099396 amu The atomic mass of elementsElement | Atomic mass(Amu) |
Hydrogen | 1.008 |
Helium | 4.002 |
Lithium | 6.94 |
Beryllium | 9.012 |
Boron | 10.81 |
Carbon | 12.011 |
Nitrogen | 14.007 |
Oxygen | 15.999 |
Fluorine | 18.998 |
Hydrogen | 1 |
Helium | 4 |
Lithium | 7 |
Beryllium | 9 |
Boron | 11 |
Carbon | 12 |
Nitrogen | 14 |
Oxygen | 16 |
Fluorine | 18 |