Write the following balanced nuclear equations:

Question

Th-234 emits a beta particle and gamma rays.

Alpha decay of Bi-212

Answer 1

1. ⁹⁰Th₂₃₄ ---> ⁹¹Pa₂₃₂ + e^- + γ The emission of an electron increases the atomic number by 1 but leaves the atomic mass unchanged.
2. ⁸³Bi₂₁₂ ^{------.> 2}He₄ + ⁸¹Tl₂₀₈ An alpha particle is a helium nucleus with a mass of 4 and atomic number of 2. Removing a helium nucleus form Bi reduces the atomic number by 2 and the mass by 4 resulting in thallium with atomic number 81 and atomic mass 208.