Complete the table to show the maximum oxidation number for each element in its compounds.
Explain why the atomic radius of elements in the third period falls from Na to Cl.
The radius of the most common ion of Mg is much smaller than the radius of the most common ion of S. Identify both ions and explain the difference in their radii.
Write an equation to represent reaction 1, the formation of compound A.
Give two observations you could make in reaction 2.
Name compound B
Cerium has the same structure and bonding as a typical metal. Draw a labelled diagram to show the structure and bonding in cerium.
Cerium(IV) oxide, $\text{CeO}_2$, is a ceramic. Suggest two physical properties of cerium(IV) oxide.
A naturally occurring sample of cerium contains only four isotopes. Data for three of the isotopes are shown in the table. The $A_r$ of the sample is $140.116$. Use these data to calculate the relative isotopic mass of the fourth isotope in this sample of cerium. Give your answer to three decimal places.