(a)[1]
State the group number for the alkali metals.
(b(i))[1]
has the greatest melting point.
(b(ii))[1]
has the greatest density.
(b(iii))[1]
has the lowest reactivity.
(b(iv))[1]
burns with a lilac flame.
(b(v))[1]
is present in fertilisers to improve plant growth.
(c)[3]
Complete Fig. 5.1 so that the electronic configurations of the ions in sodium sulfide are shown. Include the charges on the ions.
(d(i))[1]
State the name given to these naturally occurring atoms of rubidium.
(d(ii))[3]
Complete Table 5.1 to show the numbers of protons, neutrons and electrons in the rubidium atom and ion shown.
(d(iii))[1]
Find the relative abundance of $^{85}\text{Rb}$ in rubidium. Give your answer as a percentage.