an atom's configuration based on its number of electrons ends at 3p3. another atom has nine more electrons. starting at 3p, what is the remaining configuration?
A.)3p^6 4s^2 3d^3
B.)3p^3 4s^2 3d^5
C.)3p^6 3d^4 4s2
D.)3p^3 3d^7 4s2