Question

Which of the following ions is diamagnetic?

• A. Cr$^{2+}$
• B. V$^{2+}$
• C. Sc$^{3+}$
• D. Ti$^{3+}$

Hint:

Diamagnetic ions have all electrons paired, making them weakly repelled by magnetic fields.

Answer 1

The Correct Option is C

Step 1: Define diamagnetism.
Diamagnetism is the property of materials that have no unpaired electrons. These materials are weakly repelled by a magnetic field.
Step 2: Check the electronic configuration of each ion.
- Cr$^{2+}$ and V$^{2+}$ both have unpaired electrons and are paramagnetic. - Sc$^{3+}$ has no unpaired electrons and is diamagnetic. - Ti$^{3+}$ also has unpaired electrons and is paramagnetic.
Step 3: Apply to the options.
Sc$^{3+}$ is the only ion without unpaired electrons, making it diamagnetic.
Final Answer: \[ \boxed{\text{Sc}^{3+}} \]