Explain the meaning of ionisation energy.
The first seven ionisation energies for an element, $A$, in $\text{kJ mol}^{-1}$, are: $1012$, $1903$, $2912$, $4957$, $6274$, $21269$, $25398$.
State which group of the Periodic Table $A$ is most likely in. Justify your response.
Give the full electronic configuration of the Period 2 element in the same group as $A$. $1s^2$ \dotfill
A different element, $Z$, from the same group of the Periodic Table as $A$, reacts with chlorine to make a compound whose empirical formula is $ZCl_2$. The percentage composition by mass of $ZCl_2$ is: $Z$, $31.13$; $Cl$, $68.87$.
Define relative atomic mass.
Calculate the relative atomic mass, $A_r$, of $Z$. Give your answer to three significant figures.
Chlorides of the Period 3 elements in the Periodic Table behave differently when water is added, because their structures and bonding are not the same.
Write equations to show what happens when sodium chloride, $NaCl$, and silicon chloride, $SiCl_4$, are each placed in excess water.
State and explain how these two chlorides differ in their behaviour when added to water, in terms of their structures and the bonding present.
Sulfur reacts with fluorine to make $SF_6$. State the shape of $SF_6$ and its bond angle.