Give the charge and full ground-state electron configuration of the monatomic ion most likely to be formed by the element. rb a. rb+: 1s22s22p63s23p64s23d104p65s2 b. rb+: 1s22s22p63s23p64s23d104p65s1 c. rb+: 1s22s22p63s23p64s23d104p5 d. rb+: 1s22s22p63s23p64s23d104p6 e. none of these

ANSWER IS D.

EXPLANATION:

The electronic configuration of neutral Rubidium atom is 1s2,2s2,2p6,3s2,3p6,3d10,4s2,4p6,5s1.

when a monoatomic ion is to be formed the Rubidium atom loses one electron from 5s orbital so the electronic configuration for the ion is 1s2,2s2,2p6,3s2,3p6,3d10,4s2,4p6.

you need to have a picture of the atom that way we can answer it