One should create simultaneously one … 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. Magnesium-23 has 12 protons and 11 neutrons. 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). Want to see the full answer? check_circle Expert Solution. 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 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? arrow_back. The positron does not exist in our environment. See solution. Check out a sample textbook solution. 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? 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. In positron emission, the atomic number Z decreases by one while the mass number A remains the same. It has the mass … Positron emission increases the number of neutrons and decreases the number of protons, making the nucleus more stable. The element will have an atomic number of 42, so the element is molybdenum (Mo). 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. 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. 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. How do the mass number and atomic number of a nucleus change when the nucleus produces 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. What happens to the mass number and atomic number of a nuclide that emits 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). The neutron:proton ratio is 11:12 or 0.92:1. 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