The atomic number is 20.
The mas number is 40.078
Calcium is in period 4.
Calcium is in group 2
Calcium is in the alkaline metals
Calcium is a solid
Calcium is a metal
Put in toothpaste
Calcium is put in toothpaste because it is a mineral and it strengthens teeth
Calcium is used by metal workers to extract metals
Calcium is put in animal food because it is a mineral and it strengthens the animals bones and body's