Beta plus decay - positron emission - causes the atomic number of the nucleus to decrease by one and the mass number remains the same. check_circle Expert Solution. One should create simultaneously one … It has the mass … arrow_back. 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. See solution. Positron emission increases the number of neutrons and decreases the number of protons, making the nucleus more stable. 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. The positron does not exist in our environment. Chapter 19, Problem 12QAP. 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 neutron:proton ratio is 11:12 or 0.92:1. 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. What are the mass number and charge of a positron? 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). The element will have an atomic number of 42, so the element is molybdenum (Mo). In positron emission, the atomic number Z decreases by one while the mass number A remains the same. We exist in a world made up of matter. How do the mass number and atomic number of a nucleus change when the nucleus produces a positron? The balanced equation would be 43 95 Tc -> 1 0 e + 42 95 Mo. 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. What Exactly Is 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). Want to see the full answer? 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. Check out a sample textbook solution. We define matter as something that has mass and occupies space. 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