a. Using the symbol of the previous noble gas to indicate the core electrons, choose the electron configuration for the element arsenic, Z=33. [Ne]3s23p64s23d104p3[Ar]4s23d104p3[Ar]3d104s24p3[Ne]3s23p63d104s24p3 b. Using the symbol of the previous noble gas to indicate the core electrons, choose the electron configuration for the element nickel, Z=28. [Ar]4s23d8[Ne]3s23p64s23d8[Ar]3d74s2[Ne]3s23p63d84s2 c. Using the symbol of the previous noble gas to indicate the core electrons, choose the electron configuration for the element strontium, Z=38. [Ne]3s23p64s23d104p65s2[Ar]4s23d104p65s2[Ar]3d104s24p65s2[Kr]5s2 d. Using the symbol of the previous noble gas to indicate the core electrons, choose the electron configuration for the element sulfur, Z=16. [He]2p63s23p4 [He]2s22p63s23p4 [Ne]3s23p4