Fill in the table with the bonding type and structure for some Period 3 oxides.
Explain why the boiling point of $\text{SiO}_2$ is much higher than that of $\text{SO}_3$.
Explain what the term amphoteric means for $\text{Al}_2\text{O}_3$. Use chemical equations to illustrate your answer.
State what you would observe when a small piece of $\text{Na}_2\text{O}$ is put into water.
Selenium reacts with fluorine to produce $\text{SeF}_6$ molecules. Predict the shape of a molecule of $\text{SeF}_6$.
Gaseous $\text{SeO}_2$ reacts to make a solid polymer, as shown. In this reaction, one Se=O bond is replaced by two Se-O bonds to form a polymer. The bond enthalpy of Se=O is $514\ \text{kJ mol}^{-1}$. Use these data to calculate the bond enthalpy, in $\text{kJ mol}^{-1}$, of Se-O.
Because $\text{SeO}_2$ reacts in a similar way to $\text{SO}_2$, suggest an equation showing how $\text{SeO}_2$ reacts with aqueous sodium hydroxide, $\text{NaOH}$.