The balanced equation would be 43 95 Tc -> 1 0 e + 42 95 Mo. In positron emission, the atomic number Z decreases by one while the mass number A remains the same. arrow_back. According to the Einstein formula E = M c² relating mass and energy, it is possible to produce positrons with an energy greater than 511 kEv, the mass energy of the positron or electron. Positron emission increases the number of neutrons and decreases the number of protons, making the nucleus more stable. Beta plus decay - positron emission - causes the atomic number of the nucleus to decrease by one and the mass number remains the same. Answer Thus, the age of the rock will be $6.42 \times 10^{9}$ yr and the correct answer will be option is (B). We exist in a world made up of matter. Positron emission or beta plus decay (β + decay) is a subtype of radioactive decay called beta decay, in which a proton inside a radionuclide nucleus is converted into a neutron while releasing a positron and an electron neutrino (ν e). See solution. The positron or antielectron is the antiparticle or the antimatter counterpart of the electron.The positron has an electric charge of +1 e, a spin of 1/2 (the same as the electron), and has the same mass as an electron.When a positron collides with an electron, annihilation occurs. check_circle Expert Solution. Magnesium-23 has 12 protons and 11 neutrons. Want to see the full answer? If this collision occurs at low energies, it results in the production of two or more photons. One should create simultaneously one … What Exactly Is a Positron? What are the mass number and charge of a positron? The element will have an atomic number of 42, so the element is molybdenum (Mo). Check out a sample textbook solution. How do the mass number and atomic number of a nucleus change when the nucleus produces a positron? What happens to the mass number and atomic number of a nuclide that emits a positron? Calculation of atomic number – y will be the atomic number of the new particle/element; it plus the atomic mass of the positron must equal the atomic number of technetium – 43 = 1 + y; so y = 42. We define matter as something that has mass and occupies space. The mass of the positron is the same as the mass of the electron, about 0.511 MeV/c2 or about 9.11 x 10-31 kg. Positron, also called positive electron, positively charged subatomic particle having the same mass and magnitude of charge as the electron and constituting the antiparticle of a negative electron. Chapter 19, Problem 12QAP. It has the mass … The positron does not exist in our environment. 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