Question

In β-emission from a radioactive substance, an electron is ejected. This electron comes from ______.

Options

• the outermost orbit of an atom

• the inner orbits of an atom

• the surface of substance

• the nucleus of an atom

Answer 1

In β-emission from a radioactive substance, an electron is ejected. This electron comes from the nucleus of an atom.

Explanation:

Radioactivity is a nuclear phenomenon. Hence, electrons come out of the nucleus. An electron is created as a result of the decay of one neutron into a proton inside the nucleus, and it is not possible for the electron to stay inside the nucleus; thus, it is spontaneously emitted.