Question

question 17 (1 point)
in $\beta$- decay
\bigcirc a proton is emitted.
\bigcirc a neutron is emitted.
\bigcirc an electron is emitted.
\bigcirc an electron decays into another particle.

Explanation:

In β⁻ decay, a neutron in the nucleus converts to a proton, and an electron (β⁻ particle) is emitted. A proton isn't emitted (that's not β⁻ decay), a neutron isn't emitted (it's converted), and electrons don't decay in this process. So the correct description is that an electron is emitted.

Answer:

an electron is emitted.