State what the term isotope means.
Fill in the table for two magnesium isotopes, $^{24}\text{Mg}$ and $^{26}\text{Mg}$, by stating the number of protons, neutrons and electrons in each.
A magnesium sample contained these isotopes: $^{24}\text{Mg}$, $78.60\%$; $^{25}\text{Mg}$, $10.11\%$; $^{26}\text{Mg}$, $11.29\%$. Calculate the relative atomic mass, $A_r$, of magnesium in this sample. Give your answer to an appropriate number of significant figures.
Construct a balanced equation for the reaction of magnesium with chlorine.
When a $2.45\,\text{g}$ sample of antimony was heated in chlorine under suitable conditions, $4.57\,\text{g}$ of a chloride A were formed. Calculate the amount, in moles, of antimony atoms that reacted.
Calculate the amount, in moles, of chlorine atoms that reacted.
Use your answers to (i) and (ii) to find the empirical formula of A.
The empirical and molecular formula of A are the same. Construct a balanced equation for the reaction between antimony and chlorine.
Chloride A melts at $73.4\,^{\circ}\text{C}$, whereas magnesium chloride melts at $714\,^{\circ}\text{C}$. What type of bonding is present in magnesium chloride?
Suggest what type of bonding is present in A.