(a(i))[2]
Complete the table so that you can estimate the relative hardness of potassium and the melting point of rubidium.
(a(ii))[1]
Use the information in the table to predict the observation when lithium reacts with cold water.
(b)[1]
Write down the electronic structure for a sodium atom.
(c(i))[1]
Use the information given in the equation to explain why the solution formed is alkaline.
(c(ii))[2]
Describe how you could use a named indicator solution to demonstrate that the solution is alkaline.
(d)[2]
Calculate the relative formula mass of $\text{NaBH}_4$. Show all your working. Use your Periodic Table to assist you.