Using the list of elements, identify one that sinks in cold water and reacts quickly when placed in it. State the element's symbol.
From the list of elements, identify one element whose molecules include $\pi$ bonding.
Using the list of elements, identify one that forms a toxic oxide in the gaseous state.
From the list of elements, identify the element that has a giant molecular structure and forms an oxide that also has a giant molecular structure.
From the list of elements, identify an element that forms a covalent chloride which dissolves in water and gives a conducting solution.
From the list, identify the Period 3 element ($\text{Na}$ to $\text{Ar}$) that has the highest electrical conductivity.
Some Period 3 elements burn with a coloured flame when heated in oxygen or chlorine. Give the symbol of one such element, the formula of the oxide that forms, and the flame colour that would be observed.
For the element used in (i), give the formula of the chloride formed, and state the pH of the solution formed when this chloride is shaken with water.
Chlorine reacts with both bromine and iodine to form $\text{BrCl}$ and $\text{ICl}$ respectively. Using outer electrons only, draw a dot-and-cross diagram to show the bonding in $\text{ICl}$.
Suggest why the melting point rises from $\text{Cl}_2$ to $\text{ICl}$.
Suggest which of $\text{Cl}_2$, $\text{BrCl}$ or $\text{ICl}$ has the largest permanent dipole, and explain your answer.