When U-238 transmutates into Th-234, what does this represent?
#""_(92)^(238) "U" -> ""_(90)^(234)"Th" + ""_2^4 "He"#
an alpha particle has a form identical to a helium nucleus.
the mass number of an atom is its number of protons added to its number of neutrons.
it can also be found that the mass number of an alpha particle is
releasing an alpha particle from an atom would decrease its mass number by
here, the mass number decreases by