The atomic number of an element which can not show the oxidation state of `+3` is-

Options

A. 13
B. 32
C. 33
D. 17

Answer

To solve the question regarding the atomic number of an element that cannot show the oxidation state of +3, we will analyze the oxidation states of the elements based on their atomic numbers.

### Step-by-Step Solution:

1. **Identify the Elements and Their Atomic Numbers**:
- The question mentions elements with specific atomic numbers:
- Atomic number 13: Aluminium (Al)
- Atomic number 32: Germanium (Ge)
- Atomic number 33: Arsenic (As)
- Atomic number 17: Chlorine (Cl)

2. **Determine the Group of Each Element**:
- Aluminium (Al) is in Group 13.
- Germanium (Ge) is in Group 14.
- Arsenic (As) is in Group 15.
- Chlorine (Cl) is in Group 17.

3. **Analyze Oxidation States**:
- Aluminium (Al) can exhibit oxidation states of +3.
- Arsenic (As) can also show +3 oxidation state.
- Chlorine (Cl) can show +3 oxidation state as well.
- Germanium (Ge), while it can show oxidation states of +4 and +2, does not exhibit a +3 oxidation state.

4. **Conclusion**:
- Since Germanium (Ge) is the only element listed that does not show a +3 oxidation state, we conclude that the atomic number of the element that cannot show the oxidation state of +3 is **32** (which corresponds to Germanium).

### Final Answer:
The atomic number of the element which cannot show the oxidation state of +3 is **32** (Germanium).

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