W.P. Wijesundera, S.H. Vosko, and F.A. Parpia (Phys. Rev A 51, 278 (1995)) attempted to determine the electron configuration of the ground state of lawrencium, element 103. The two contending configurations are [Rn]5f¹⁴7s²7p¹ and [Rn]5f¹⁴6d7s².

Write down the term symbols for each of three configurations, and identify the lowest level within each configuration.

Which level would be lowest according to a simple estimate of spin-orbit coupling?