![](https://freight.cargo.site/t/original/i/e03bcc8c90765cc2687f941e27b7c8cdd6101df3ee443154e1cf7e1f0e1bc0fd/Calcium-13.png)
“I am used as a reducing agent in preparing other metals such as thorium and uranium. It is also used as an alloying agent for aluminium, beryllium, copper, lead and magnesium alloys.
I am widely used. There are vast deposits of limestone (calcium carbonate) used directly as a building stone and indirectly for cement. When limestone is heated in kilns it gives off carbon dioxide gas leaving behind quicklime (calcium oxide).