Which statement is correct about the Group 2 elements and their compounds?
The first ionisation energy of strontium is higher than the first ionisation energy of barium.
The solubility of strontium sulfate in water is greater than the solubility of calcium sulfate.
The enthalpy of hydration of the Ba2+\text{Ba}^{2+}Ba2+ ion is more exothermic than that of the Sr2+\text{Sr}^{2+}Sr2+ ion.
The thermal decomposition of barium carbonate occurs at a lower temperature than that of magnesium carbonate.