The Data Booklet is needed for this question. $X$ belongs to the $s$-block. $X$ produces an insoluble carbonate with the formula $X\text{CO}_3$. $X$ also produces a hydroxide that is more soluble than strontium hydroxide. What could be the identity of $X$?
- Abarium
- Bcalcium
- Ccobalt
- Drubidium