Explain which of the following represents the change in electronic configuration that is associated with the first ionization energy of magnesium?
a. [Ne]3s13p1 ---> [Ne]3s1 + e-
b. [Ne]3s2 ---> [Ne]3s13p1
c. [Ne]3s2 ---> [Ne]3s1 + e-
d. [Ne]3s2 + e- ---> [Ne]3s23p1