(a(i))[2]
Finish the table by predicting the boiling point of bromine and the density of liquid iodine at its boiling point.
(a(ii))[1]
Describe how the depth of colour of the halogens changes down the group.
(a(iii))[2]
Deduce the state of chlorine at $-50^\circ$C. Explain your answer.
(b)[1]
The halogens have molecules that are diatomic. Explain the meaning of the term diatomic.
(c(i))[1]
Define nucleon number.
(c(ii))[1]
State one medical use of radioactive isotopes.
(c(iii))[1]
The isotope $^{235}$U is also radioactive. State the major use of this isotope of uranium.