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2 wrz 2024 · Alpha decay is a type of radioactive decay in which an unstable atomic nucleus releases an alpha particle to become more stable. This process reduces the atomic number of the original element by two and its atomic mass by four, transforming it into a different element.
8 maj 2022 · An alpha particle is a particle consisting of two protons, two neutrons, and no electrons. Essentially, it is a helium-4 nucleus. Other names for alpha particles are alpha rays or alpha radiation. The symbol for an alpha particle is α, α 2+, He 2+, or 42 He 2+.
16 wrz 2022 · Learning Objectives. Compare qualitatively the ionizing and penetration power of alpha particles (α) (α) , beta particles (β) (β) , and gamma rays (γ) (γ) . Express the changes in the atomic number and mass number of a radioactive nuclei when an alpha, beta, or gamma particle is emitted.
Definition. Alpha particles are a type of ionizing radiation consisting of two protons and two neutrons bound together. They are emitted from the nucleus of certain radioactive elements during alpha decay.
Alpha Particles Rutherford showed that the alpha particle was the doubly charged nucleus of helium and therefore contained two protons and two neutrons. Following decay, the daughter nucleus has two less protons (also two less neutrons) and therefore moves two places in the Periodic Table.
Rule #1: Alpha decay is essentially the “emission” of a helium nucleus. So when an atom emits two protons and two neutrons, the atom alpha decays down the periodic table two elements (because of the ‘emission’ of two protons). For example: Uranium 238 whose atomic number is 92, becomes Thorium 234, Th, whose atomic number is 90.
Chemistry data booklet For use during the course and in the examinations First assessment 2025 Version 1.0
