Alpha
alpha particles.
The decay is: Th-230-------------Ra-226 + He-4
Thorium 230 has 90 electrons and 140 neutrons.
Thorium 230 has 90 protons and 140 neutrons - the difference is 50.
By alpha decay Th-230 is transformed in Ra-226.
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The atomic number of thorium is 90. So there are 90 protons and 90 electrons. In Th-230 isotope there are 140 neutrons (230 - 90 = 140) So there are 50 more neutrons than the number of protons.
Thorium has 90 protons. So for a neutral atom, there has to be 90 electrons. 230 is the total number of nucleons. ie 90 protons and 140 neutrons.
The atomic number of thorium is 90. so it will always have 90 protons in all its isotope.
Thorium-230 is an alpha emitting radio-isotope.The half-life is 75 380 years, the daughter isotope is radium-226.; the energy of alpha rays is4,447 MeV.
Thorium has 90 protons. It does not matter which isotope is involved.
232U alpha decays to 228Th. Thorium-228 is the daughter product of the alpha decay of uranium-232.