What happens to an atom when it emits an alpha particle?
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Alpha particle is consist of two protons and two neutrons and combined are identical to a helium-4 nucleus. The symbol for alpha radiation is the symbol for helium-4 is 42He
When an atom emits an alpha particle, the mass number decreases by 4 and the atomic number decreases by 2, resulting a new element which is two places lower in the Periodic Table than the original element.
92U238→90Th234 + 42He
Here, U-238 decreases its mass number by 4 and atomic number by 2 when it emits an alpha particle and formed a new element Th-234 which is two lower than U-238 in the periodic table.
Textbook: Introductory Chemistry
Author: Nivaldo J Tro
This textbook survival guide was created for the textbook: Introductory Chemistry, edition: 5. The answer to “What happens to an atom when it emits an alpha particle?” is broken down into a number of easy to follow steps, and 11 words. Since the solution to 8Q from 17 chapter was answered, more than 362 students have viewed the full step-by-step answer. Introductory Chemistry was written by and is associated to the ISBN: 9780321910295. This full solution covers the following key subjects: alpha, atom, emits, happens, particle. This expansive textbook survival guide covers 19 chapters, and 2046 solutions. The full step-by-step solution to problem: 8Q from chapter: 17 was answered by , our top Chemistry solution expert on 05/06/17, 06:45PM.