CHEM 101 Lecture Notes - Lecture 5: Stoichiometry, Positron, Beta Particle
Document Summary
We describe nuclear processes by using nuclear equations. Use symbol of nuclide to represent the nucleus. Alpha emission: an alpha particle contains 2 protons and 2 neutrons. Helium nucleus: loss of an alpha particle means: Beta emission: beta particle acts like an electron. Is produced from nucleus: when an atom loses a beta particle its. Gamma emission: high energy photons of light, no loss of particles from the nucleus, no change in the composition of the nucleus. Same atomic and mass numbers: generally, occurs after the nucleus undergoes some other type of decay and the remaining particles rearrange. Positron emission: postitron has charge of +1c. u. and negligible mass. (cid:862)a(cid:374)ti-electro(cid:374)(cid:863: when an atom loses a positron from nucleus. Atomic number decreases by 1: positrons result from a proton changing into a neutron. Process in which nucleus captures an inner shell electron, thereby converting a proton to a neutron.
