Informally, Atomic Mass is the number of protons and neutrons. Formally, atomic mass is normalized to the mass of Carbon-12, because the mass of the proton and the mass of the neutron are not exactly equal.
The total mass of the atom. In other words the total mass of the protons and neutrons of an atom
Carbon-12 isotope is used to define the atomic mass unit, which is equal to 1/12th of the mass of a carbon-12 atom.
The atomic weight, or atomic mass, of an element represents the average mass of its isotopes, weighted by their natural abundance. It is typically expressed in atomic mass units (amu) and reflects the total number of protons and neutrons in the atomic nucleus, which collectively define the mass number. While the mass number is a whole number indicating the total count of protons and neutrons in a specific isotope, the atomic weight accounts for the relative proportions of all isotopes of the element found in nature.
The atomic number tells how many protons are in the atom, and the atomic mass tells how many neutrons and protons are in the atom together. Like Oxygen has an atomic number of 8. It also has 8 protons. It's atomic mass is 16. It also has 16 neutrons and protons. Helium's atomic number is 1. It only has 1 proton. It's atomic mass is 1 because it doesn't have any neutrons.
Atomic mass
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The atomic mass or mass of an atom is locaed at the bottom of a sqaure on the periodic table. The atomic mass= atomic number (protons/neutrons)+electrons. Enable to find the number of electrons you must
atomic weight
One twelfth the mass of a carbon 12 atom is used to define an atomic mass unit (amu) or unified atomic mass unit (u). This unit is used to express atomic and molecular weights on a scale relative to the mass of a carbon-12 atom, making it a common reference point in chemistry.
The total mass of the atom. In other words the total mass of the protons and neutrons of an atom