atomtömegének

The term "atomtömege" translates from Hungarian to "atomic mass." Atomic mass refers to the mass of a single atom of a specific element. It is typically expressed in atomic mass units (amu). One atomic mass unit is defined as one-twelfth the mass of a carbon-12 atom. The atomic mass of an element is primarily determined by the number of protons and neutrons in its nucleus, as these subatomic particles contribute the most to the atom's mass. Electrons, while present, have a negligible mass in comparison.

Different isotopes of the same element will have slightly different atomic masses due to variations in the number of neutrons. For example, carbon-12 has an atomic mass of exactly 12 amu, while carbon-13, with an extra neutron, has a slightly higher atomic mass. When referring to the atomic mass of an element as listed on the periodic table, it represents the weighted average of the masses of all its naturally occurring isotopes, taking into account their relative abundances. This average atomic mass is a fundamental property used in chemical calculations and understanding the behavior of elements.