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How do the mass number and atomic number of a nucleus change when the nucleus produces a positron? 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. arrow_back. We exist in a world made up of matter. 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. 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. Positron emission increases the number of neutrons and decreases the number of protons, making the nucleus more stable. It has the mass … We define matter as something that has mass and occupies space. Check out a sample textbook solution. 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. Want to see the full answer? Answer Thus, the age of the rock will be $6.42 \times 10^{9}$ yr and the correct answer will be option is (B). 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 Exactly Is a Positron? What are the mass number and charge of a positron? In positron emission, the atomic number Z decreases by one while the mass number A remains the same. 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. The element will have an atomic number of 42, so the element is molybdenum (Mo). The neutron:proton ratio is 11:12 or 0.92:1. 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 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. If this collision occurs at low energies, it results in the production of two or more photons. Magnesium-23 has 12 protons and 11 neutrons. The balanced equation would be 43 95 Tc -> 1 0 e + 42 95 Mo. Chapter 19, Problem 12QAP. 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