A type of radioactiveDescribes a substance that gives off radiation‐alpha particles, beta particles, or gamma rays‐by the disintegration of its nucleus. decay in which an electronA negatively charged, sub-atomic particle with charge of 1.602 x 10-19 coulombs and mass of9.109 x 1023 kilograms; electrons have both wave and particle properties; electrons occupy most of the volume of an atom but represent only a tiny fraction of an atom's mass. from an inner shell of an atomThe smallest particle of an element that can be involved in chemical combination with another element; an atom consists of protons and neutrons in a tiny, very dense nucleus, surrounded by electrons, which occupy most of its volume. is absorbed by the nucleusThe collection of protons and neutrons at the center of an atom that contains nearly all of the atoms's mass.. In the process a protonThe positively charged particle in an atomic nucleus; its mass is similar to the mass of a hydrogen atom. is converted into a neutronThe uncharged particle in an atomic nucleus; its mass is similar to the mass of a hydrogen atom. and the atomic numberThe number of protons in the nucleus of an atom; used to define the position of an element in the periodic table; represented by the letter Z. of the elementA substance containing only one kind of atom and that therefore cannot be broken down into component substances by chemical means. decreases by one. Also called K capture, because the electron comes from the 1s orbitalA mathematically defined region of electron density around one or more atoms; a wave function that defines the properties of a particular electron in an atom or molecule. (K shell).
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