(a(i))[2]
Fill in the table by estimating the melting point of sodium and the atomic radius of rubidium.
(a(ii))[1]
Use the table evidence to explain why predicting the relative thermal conductivity of potassium is difficult.
(b(i))[1]
Write the equation for sodium reacting with oxygen to form sodium oxide, $\text{Na}_2\text{O$.
(b(ii))[1]
What type of oxide, acidic or basic, is sodium oxide? State a reason for your answer.
(c)[1]
Explain, in terms of how easily ions are formed, why copper does not react with aqueous sodium sulfate.
(d)[2]
Hydrated sodium iodate(V) is written as $\text{NaIO}_3\cdot x\text{H}_2\text{O}$. Its relative formula mass is 288. Calculate the value of $x$ in this formula.