Final answer:
Positron emission is a type of radioactive decay that occurs in neutron-poor nuclei, where a proton in the nucleus is converted into a neutron and a positron. The positron is then ejected from the nucleus.
Step-by-step explanation:
Positron emission is a type of radioactive decay that occurs in neutron-poor nuclei. In this process, a proton in the nucleus is converted into a neutron and a positron, which is a positively charged electron. The positron is immediately ejected from the nucleus. This type of decay can be illustrated by the nuclear equation: ¹B → ¹C + e⁺.