Question 1
Choose the correct word to describe the nuclear stability of the following isotope. If it is radioactive, choose the most likely mode of decay.
19F
◦ radioactive, beta
◦ radioactive, fission
◦ radioactive, alpha
◦ radioactive, neutron
◦ stable
Question 2
Choose the INCORRECT statement.
◦ Radioactivity is the emission of ionizing radiation.
◦ An alpha particle is the nucleus of a helium-4 atom.
◦ A beta particle is a neutron.
◦ A positron is like a beta particle but with a positive charge.
◦ Gamma rays are emitted from a nucleus in an excited state.