Answer:
Ni⁻
Step-by-step explanation:
To check which atom or ion does not have filled d orbital we will write the electronic configuration of given atoms and ions.
Ni⁻₂₈ = 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁹
One more electron is added into the 3d but still d is not filled.
In⁺₄₉ = [Kr]4d¹⁰ 5s² 5p⁰
One electron lose from 5p and form cation. In⁺ have filled d subshell.
Ag₄₇ = [Kr] 4d¹⁰ 5s¹
Ag have filled d subshell.
Pd₄₆ = [Kr] 4d¹⁰
Palladium also have filled d orbital.