An alpha decay is "a type of radioactive disintegration in which some unstable atomic nuclei dissipate excess energy by spontaneously ejecting an alpha particle".
What is radioactive disintegration?
Radioactive disintegration is "the process by which an unstable atomic nucleus loses energy by radiation".
What is an atomic nucleus?
An atomic nucleus is "the small, dense region consisting of protons and neutrons at the centre of an atom".
What is an alpha-particle?
An α-particle is "a helium nucleus. It contains 2 protons and 2 neutrons, for a mass number of 4".
238U → 234Th+4He
Hence, an alpha particle is emitted in this reaction.
To learn more about alpha-particle here
https://brainly.com/question/20024828
#SPJ2
