The neutron:proton ratio is 11:12 or 0.92:1. 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). What happens to the mass number and atomic number of a nuclide that emits a positron? 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. The element will have an atomic number of 42, so the element is molybdenum (Mo). The balanced equation would be 43 95 Tc -> 1 0 e + 42 95 Mo. We define matter as something that has mass and occupies space. Chapter 19, Problem 12QAP. If this collision occurs at low energies, it results in the production of two or more photons. 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. 11.4: Positron Emission Last updated; Save as PDF Page ID 79601; Contributor; A positron, also called an antielectron, is an exotic bit of matter, or more correctly, an example of antimatter.A positron is the antimatter equivalent of an electron. It has the mass … One should create simultaneously one … The positron does not exist in our environment. 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 exist in a world made up of matter. Want to see the full answer? What Exactly Is a Positron? 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. check_circle Expert Solution. arrow_back. How do the mass number and atomic number of a nucleus change when the nucleus produces a positron? Answer Thus, the age of the rock will be $6.42 \times 10^{9}$ yr and the correct answer will be option is (B). Beta plus decay - positron emission - causes the atomic number of the nucleus to decrease by one and the mass number remains the same. What are the mass number and charge of a positron? See solution. Positron emission increases the number of neutrons and decreases the number of protons, making the nucleus more stable. In positron emission, the atomic number Z decreases by one while the mass number A remains the same. The discovery of positron is also one of the great achievements that inspire innovative theories and thinking continually, and is a lot beyond the reception of human senses. 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. 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