Which of the following ions has a d5 configuration?

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Question: Which of the following ions has a d5 configuration?

Options:

Correct Answer: Mn2+

Solution:

Mn2+ has a d5 configuration as it loses two electrons from its 4s and 3d orbitals.

Which of the following ions has a d5 configuration?

Which of the following ions has a d5 configuration?

Step 1: Understand what a d5 configuration means. It means there are 5 electrons in the d orbital.
Step 2: Identify the element that has a d5 configuration in its ion form. We will look for manganese (Mn).
Step 3: Determine the electron configuration of neutral manganese (Mn). It is [Ar] 4s2 3d5.
Step 4: When manganese loses 2 electrons to become Mn2+, it loses the 2 electrons from the 4s orbital first.
Step 5: After losing 2 electrons, the electron configuration of Mn2+ becomes [Ar] 3d5.
Step 6: Since Mn2+ has 5 electrons in the d orbital, it has a d5 configuration.

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