does the mass number represent the exact mass of an atom? what other factors contribute to the actual mass of an atom besides protons and neutrons?

Oct 23, 2023 ... We consider four main lymphocyte cell types: T cells, B cells, NK cells, and plasma cells. Although plasma cells are closely related to B cells, ... Physics. the integer nearest in value to the atomic weight of an atom and equal to the number of nucleons in the nucleus of ... It differs from the exact mass of the atom in atomic mass units, amu, which is often known and expressed to six decimal places. (One amu is exactly one-twelfth ... Sep 3, 2020 ... ... mass unit (amu). The amu was originally defined based on hydrogen ... equal to its mass number (a whole number sum of protons and ... It allows us to be able to tell the difference between elements with a different number of neutrons, called isotopes. The mass number is also related to the ... Mar 20, 2025 ... The mass number is defined as the total number of protons and neutrons in an atom. It can be calculated by adding the number of neutrons and the number of ... Jan 12, 2018 ... In this video I go over Atomic Number, Atomic Mass, and Mass Number. These are three chemistry terms you'll definitely have to know for you ... Oct 27, 2011 ... by an equal sign (=) and the fixed value (optionally followed by ... (same mass number, chain mode or same charge number, charge mode). The mass number is equal to the number of protons plus neutrons. In a neutral atom, the number of protons equals the number of electrons. The charge on an ion ... Aug 29, 2024 ... ... number of electrons must equal the number of protons. This example may lead you to believe that atoms have the same number of protons and ...