(a)[1]
Define what is meant by nucleon number.
(b)[1]
State how the number of occupied electron shells in an atom is connected to the period number of that element.
(c)[2]
Write the electronic configuration for each atom and ion below. $^{28}_{14}\text{Si}$ ................. $^{37}_{17}\text{Cl}^-$ .................
(d)[5]
Fill in Table 2.1 with the missing entries.
(e(i))[2]
Define what is meant by isotopes.
(e(ii))[2]
Calculate the relative atomic mass of thallium in the sample, giving your answer to one decimal place. relative atomic mass = .................
(e(iii))[1]
Suggest why these two isotopes have the same chemical properties.