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Two fifth-period atoms, one of a transition metal, M, and the other of a main-group nonmetal,...

Two fifth-period atoms, one of a transition metal, M, and the other of a main-group nonmetal, X , form a compound with the formula M2X3 . Enter answers with noble-gas core, that is, an inner-shell configuration corresponding to nearest noble gases, plus outer electrons.

A. What is the electron configuration of atom X if M is Ru ?

(Express your answer in condensed form, in order of increasing orbital energy.)

B. What is the electron configuration of atom X if M is Rh ?

FYI- for Ru the answer is not [Kr] 4d7 5s1 and Rh = [Kr] 4d8 5s1

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