It depends on which isotope of bismuth we are talking about. Most isotopes less than bismuth-209 that decay by beta do so via beta+, and they decay to lead, while most isotopes greater than bismuth-209 that decay by beta do so via beta-, and they decay to polonium.
There are some isotopes that decay by other mechanisms, such as alpha, but the question asked only about beta.
Francium-223 decay to Ra-223.
Bismuth-210 decay to Po-210.
Bismuth is not a direct decay product of any francium isotope.
The bets decay product of francium-223 is radium-223.
The answer is Radon.
Radium
The beta decay product of francium-223 is radium-223.
The only possible product of the alpha decay of 92238U is 90234Th.
The decay product of uranium 238 by alpha disintegration (not beta or gamma) is thorium 234.
I would assume potassium-42 decays into calcium-42 via beta decay. Potassium-42 --> Calcium-42 + electron
Atomic number becomes two units less and atomic mass four units less. Bismuth is the answer.
The beta decay product of francium-223 is radium-223.
Bismuth-214 produces Polonium-214 by beta- decay. It also produces Thallium-210 by alpha decay, though at a much smaller percentage.
bismuth 210 decays by beta decay to polonium 210 that decays by alpha decay to lead 206
Bismuth-214
Atomic number of radium is 88 and that of bismuth is 83. So atomic number is to be reduced by 5. But as alpha is emitted atomic number reduces by 2. So a beta decay is needed which would increase the atomic number by 1. So 3 alpha decay and one beta decay would make radium into bismuth
Polonium-212 is formed by beta decay of bismuth-212.
Lead-209 undergoes beta- decay to become Bismuth-209 82209Pb --> 83209Bi + -10e + v-e emitting an electron and an electron antineutrino.
Polonium-218-------------alpha---------------Lead-214
Protactinium 234 is a decay product of thorium 234; the nuclear reaction is: 23490Th-----------beta rays-------------23491Pa
The only possible product of the alpha decay of 92238U is 90234Th.
Nitrogen-14, by way of beta decay.
The decay product of uranium 238 by alpha disintegration (not beta or gamma) is thorium 234.