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4. What is the correct electron configuration and quantum numbers for Ca with atomic mass of 20.

a. 1s2 2s22p6 352 3p6 452 n=4 1=1 ml=1 ms= +1/2 =
b. 1s2 2s22p6 3s2 3p6 4s2 n=4 l=0 ms= +1/2
c. 1s2 2s22p6 352 3p8 n=31=0 ml=0 ms=-1/2
d. 182 282 2p6 352 3p8 IF=3 l=1 ml=-1 ms=-1/2 ml=0​