Suggest the mass numbers for these five peaks and state the species responsible.
Predict the abundance ratios for the three species with the highest mass numbers.
Draw the dot-and-cross diagram for strontium chloride, $\text{SrCl}_2$, showing only the outer-shell electrons.
Use the data below, together with relevant data from the Data Booklet, to calculate the lattice energy of strontium chloride. You may find it helpful to draw a Born-Haber cycle. Given: Electron affinity per mole of chlorine atoms = $-349\,\text{kJ mol}^{-1}$ Standard enthalpy of atomisation of $\text{Sr}(s)$ = $+164\,\text{kJ mol}^{-1}$ Standard enthalpy of formation of $\text{SrCl}_2(s)$ = $-830\,\text{kJ mol}^{-1}$
Strontium nitrate, $\text{Sr(NO}_3)_2$, can be made readily from strontium carbonate, $\text{SrCO}_3$. Suggest an equation for this preparation of strontium nitrate.
Write an equation for the reaction that takes place when strontium nitrate is heated.
Describe and explain the trend in the thermal stabilities of Group II nitrates.