are there any elements that do not have stable isotopes and therefore a range of mass numbers?

As the number of neutrons in an atom increases or decreases, the isotopes tend to become more and more unstable until they get to the point where they decay ... Specifically, the atomic number corresponds to the number of protons found in the nucleus of an atom. Since each element on the periodic table has a unique ... 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 ... Jul 22, 2020 ... When compared to the average mass per nucleon in carbon-12, which is moderately strongly-bound compared with other atoms, the mass defect of ... The atomic mass now known to be the sum of the protons and neutrons in the nucleus. Mass Number. Rutherford showed that the vast majority of the mass of an atom ... Jul 30, 2023 ... Solution: Mass number = number of neutrons + number of protons. Number of protons is equal to the atomic number. We can find the atomic ... 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- ... The number of electrons in an atom is normally equal to the number of protons in the nucleus. ... Hence the nominal mass, based on the mass number, approximates ... 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 number of electrons in a neutral atom equals the: A. Mass number. B ... For what kind of radiation rem is not approximately equal to rad? A. Alpha ...