What are the four quantum numbers for the 19th electron in Calcium?

the quantum numbers of the 19th electron of Ca is the same as the quantum number of the last electron of K, which is the ff:

principal quantum number  = 4 (bec. its in period 4 of s block)

azimuthal quantum number = 0 (bec. it is in the s block)

magnetic quantum number = 0 (bec. 4s has only one orbital: 0)

magnetic spin quantum number = +1/2 (by convention, the first half of the blocks is 1/2 and the second half is -1/2)

these answers were arrived at by looking at the periodic table
refer to periodic table:
http://www.elementsdatabase.com/

alternatively, you can try drawing the orbital diagram and get the same answers