what types of nuclear processes involve a change in mass number? how is the concept of mass number used in nuclear medicine?

May 16, 2018 ... The mass number is the sum of protons and neutrons. The atomic mass is the weighted average of the masses of individual elements weighted by abundance. ATOMIC MASS NUMBER (A) - A number equal to the number of nucleons (neutrons plus protons) within the nucleus of an atom. ATOMIC MASS UNIT (amu) - The atomic ... The mole allows scientists to calculate the number of elementary entities (usually atoms or molecules ) in a certain mass of a given substance. Avogadro's ... 2) Mass Concentration. The mass concentration of a solution is equal to the mass ... The number of moles we started with is equal to the number of moles of ... 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 ... The mass number is approximately equal to the atomic mass, which is the mass of a single atom of a element measured in atomic mass units (amu). The atomic mass ... ... equal to 75 U/mL). Data of patients in two groups were collected and evaluated such as gender, age, body mass, number of patients with chemical burn ... ... mass number. The number of protons and neutrons is often—but not always—equal. Two atoms having the same atomic number (i.e., belonging to the same element) ... 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 ... Dec 31, 2017 ... The number of obese people in the world, despite ongoing prevention ... In consequence, after 24 months it was higher than or equal to ...