
Explanation:
Ions typically have different electron configurations compared to the parent atoms. This is due to the difference in the number of electrons depending on whether it is an anion (more electrons) or cation (less electrons).
a)Ru^3+
The electron configuration of Rubidium is; [Kr] 4dⷠ5s¹
But Ru^3+ has 3 electrons lesser and would have the same electron configuration as Niobium.
The electron configuration is [Kr] 4dⓠ5s¹
b)As^3ā
The electron configuration of Arsenic is; [Ar] 3d¹Ⱐ4s² 4p³
But As^3ā has 3 electrons more and would have the same electron configuration as Krypton.
The electron configuration is [Ar] 3d¹Ⱐ4s² 4pā¶
c) Y^3+
The electron configuration of Yttrium is; [Kr] 4d¹ 5s²
But Y^3+ has 3 electrons less and would have the same electron configuration as Krypton.
The electron configuration is [Ar] 3d¹Ⱐ4s² 4pā¶
d) Pd^2+
The electron configuration of Palladium is; [Kr] 4d¹ā°
But Pd^2+ has 2 electrons less and would have the same electron configuration as Ruthenium.
The electron configuration is [Kr] 4dⷠ5s¹