A β+\beta^+β+ particle (positron) is a fast-moving positive electron. Which statement explains how β+\beta^+β+ particles are emitted from a radioactive atom?
An electron is emitted as a β+\beta^+β+ particle from an inner electron shell of the atom.
An electron is emitted as a β+\beta^+β+ particle from an outer electron shell of the atom.
A proton changes into a neutron and a β+\beta^+β+ particle is emitted from the nucleus.
A neutron changes into a proton and a β+\beta^+β+ particle is emitted from the nucleus.
120 exam-style questions on CIE IGCSE Physics 5.2.3a Radioactive decay. Each one has a worked solution and a mark scheme showing where the marks go.