Final answer:
Beta decay is a type of radioactive decay in which a neutron within the nucleus converts to a proton, emitting an electron. The correct representation of beta decay among the options is A. Bi₈₃²¹² → Po₈₄²¹² + e⁻ + barνₑ.
Step-by-step explanation:
Beta decay is a type of radioactive decay in which a neutron within the nucleus converts to a proton, and in the process, an electron (beta particle) is emitted. The correct representation of beta decay among the given options is:
A. Bi₈₃²¹² → Po₈₄²¹² + e⁻ + barνₑ
In this reaction, the atomic number (Z) increases by one, and the mass number (A) remains the same, which is characteristic of beta decay.