The Rydberg equation v = R_H(1/n_1^2 - 1/n_2^2) accurately predicts the UV-visible emission spectrum of the hydrogen atom. A form of the Rydberg equation may also be used to predict the UV-visible emission for all of the following EXCEPT
(A)hydride ion, H− (B)deuterium atom, D (C)tritium atom, T (D)helium cation, He+
A