how does the relative abundance of different isotopes of an element affect its average atomic mass? what is the definition of mass number in the context of atomic structure?

(e) Mass number is the sum of all protons and electrons in an atom. 7. A positron has a mass number of _____, a charge of _____, and a mass equal to that of a( ... Since protons and electrons have equal and opposite charges, this means that atoms have no overall electrical charge. For example, the atomic number of sodium ... 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 ... The atomic number is equal to the number of protons in an atom's nucleus. The atomic mass is the sum of the mass of protons and neutrons. An updated Massachusetts Equal Pay Act (MEPA) went into effect on July 1, 2018 ... Mass relay dial 7-1-1 and connect via main number. Fax. (617) 727-5762. Learn ... 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 ... Mar 26, 2025 ... Mass number is always equal to the sum of the number of protons and the number of neutrons. Electrons: Protons: Jul 8, 2020 ... When an α-particle is emitted, mass number of nuclide X is reduced to 4, and its charge number is reduced to 2, But when a β-particle is emitted, mass number ... Protons are the positively charged subatomic particles present in the atomic nuclei. They have a charge equal to that of an electron in magnitude and mass of ... Most of the ions formed in a mass spectrometer have a single charge, so the m/z value is equivalent to mass itself. ... even-number mass. even-electron ions odd- ...