(a(i))[2]
Complete the table by estimating: • the boiling point of sodium • the hardness of rubidium.
(a(ii))[2]
Predict the physical state of potassium at 50 ^{\circ}C. Give a reason for your response.
(b(i))[2]
Complete the chemical equation for this reaction. $\ldots \text{Na} + 2\text{NaOH} \rightarrow \ldots \text{Na}_2\text{O} + \text{H}_2$
(b(ii))[2]
Describe a test that identifies hydrogen. test observations
(c)[3]
Explain these observations with the kinetic particle model.