Anthony T. answered 03/23/21
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5p __ __ __ (no arrows) Cadmium [Kr] 5s2 4d10
4d __ __ __ __ __ (four up arrows) Niobium [Kr] 5s1 4d4
5s __ (one up arrow) Rubidium [Kr] 5s1
[Kr] refers to the electron configuration for Krypton.