Calcium

Atomic symbol: Ca
Atomic number: 20
Atomic mass: 40.08

Appearance: Dull gray, silver solid at 25°C

Group: 2
Period: 4
Series: Alkaline earth metals
Block: s
Electron configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s²

3rd most abundant metal, after iron and aluminum.

Essential to the human body in relatively large quantities.

Burns with an orange-red flame.

Fun Fact! The average human contains approximately 1kg of calcium, of which 99% is stored in our bones.

https://www.rsc.org/periodic-table/element/20/calcium#:~:text=Calcium%20is%20all%20around%20us,abundant%20dissolved%20ion%20in%20seawater.