atómmassa

Atómmassa, also known as atomic mass or atomic weight, is a fundamental property of an atom that represents the total mass of its protons, neutrons, and electrons. It is typically expressed in atomic mass units (amu), with one amu approximately equal to the mass of a single proton or neutron. The atomic mass of an element is not a whole number because it takes into account the natural abundance of different isotopes of that element.

The atomic mass of an element can be found on the periodic table of elements, usually listed below the element's symbol. For example, the atomic mass of carbon is approximately 12.01 amu, and the atomic mass of oxygen is approximately 16.00 amu. These values are averages of the atomic masses of the naturally occurring isotopes of each element.

Atomic mass is an important concept in chemistry and physics, as it is used to calculate the molar mass of a substance, which in turn is used to determine the amount of substance in a given sample. It is also used in nuclear physics to understand the behavior of atomic nuclei and the processes that occur during nuclear reactions.