What is the abbreviation for calcium?
Element Name: Ca
Electron configuration: [Ar]
I wasn't actually sure which one you meant.
Group two, period four, holds Calcium as Ca with an atomic number of 20.
If you needed the electron configuration, it would be
and when you're abbreviating that, you take the last noble gas it had passed; Ar.
Then, fill in until you get to the Ca. Which would look like: [Ar]