Elements Y and Z are both located in Period 3 of the Periodic Table. When the chloride of element Y is placed in water, it reacts, and a solution with $\text{pH }2$ is formed. When the chloride of element Z is placed in water, it dissolves, and a solution with $\text{pH }7$ is formed. Which statement accounts for these observations?
- ABoth chlorides hydrolyse in water.
- BElement Y is magnesium and element Z is sodium.
- CElement Y is phosphorus and element Z is aluminium.
- DElement Y is silicon and element Z is sodium.