So as not to release the metal vapor trapped in the tube, which is lighter than air.
calcium is a metal
No, it is not. Calcium is a metal but calcium carbonate is not.
Calcium is a metal.
Calcium is a metal
Calcium does not react with metal because it is a metal.
Calcium is a metal (an alkaline earth metal)
Calcium is the metal present in calcium hydroxide..
Calcium is a Metal.
No, calcium is a metal.
calcium is a metal
Calcium is not a non-metal, it is an alkaline earth metal.
Calcium is a metal and is a hard one