Strontium-90 is a radioactive isotope of strontium. An atom of strontium-90 has 38 protons in its nucleus.
Another isotope of strontium is strontium-88.
Determine the number of protons in a strontium-88 nucleus.
Determine the number of neutrons in a strontium-90 nucleus.
Determine the number of electrons orbiting the nucleus of a single neutral strontium-90 atom.
Strontium-90 decays by emitting a β−\beta^-β−-particle.
State what happens to the nucleus of strontium-90 when it emits a β−\beta^-β−-particle.
People working with radioactive sources need to take safety precautions.
State a suitable material (and its approximate thickness) that will absorb all beta radiation.
Apart from using shielding, state how a person can reduce the amount of ionising radiation they absorb when they handle samples of radioactive substances.
170 exam-style questions on CIE IGCSE Physics 5.1.2a Composition of the nucleus and isotopes. Each one has a worked solution and a mark scheme showing where the marks go.