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Radon-222 undergoes alpha decay to produce polonium-218as a daughter.
Naturally occuring Radon gas decays by alpha particle emission. However, many of the decay chain products have very short half lives, of which some decay by alpha particle emission and others by beta particle emission.
Uranium-235 will not beta decay first. If you google "Chart of Nuclides" you can follow the entire decay chain yourself using each isotope's most likely decay type.
Radium 226 decays by alpha emission to Radon 222. A helium nucleus is emitted by alpha emission which makes the mass reduce by 4 and its atomic number by 2.
232U alpha decays to 228Th. Thorium-228 is the daughter product of the alpha decay of uranium-232.
Gold never decays by alpha emission, it either decays by -beta, +beta, K capture, or gamma emission depending on isotope.Natural gold is isotopically pure gold-197, which is stable.
Californium-251 decay by alpha emission.
The decay product of uranium 238 by alpha disintegration (not beta or gamma) is thorium 234.
Alpha emission means that an alpha particle (2 protons + 2 neutrons) are emitted, so the original nucleus has 2 protons and 2 neutrons more.
Radon-222 undergoes alpha decay to produce polonium-218as a daughter.
Naturally occuring Radon gas decays by alpha particle emission. However, many of the decay chain products have very short half lives, of which some decay by alpha particle emission and others by beta particle emission.
Radium 226 decays by alpha emission to Radon 222. A helium nucleus is emitted by alpha emission which makes the mass reduce by 4 and its atomic number by 2.
Uranium-235 will not beta decay first. If you google "Chart of Nuclides" you can follow the entire decay chain yourself using each isotope's most likely decay type.
The isotope lead-204 is obtained.
232U alpha decays to 228Th. Thorium-228 is the daughter product of the alpha decay of uranium-232.
The isotope thorium-232 is an alpha emitter; extremely rare are decays by spontaneous fission or double beta emission.
Atomic number increases by one.