Which of the following actinoids show oxidation states upto +7?

Options

A. Am
B. Pu
C. U
D. Np

Explanation

To determine which actinoids show oxidation states up to +7, we will analyze the oxidation states of the given actinoids: Americium (Am), Plutonium (Pu), Uranium (U), and Neptunium (Np).

### Step-by-Step Solution:

1. **Identify the Actinoids and Their Atomic Numbers:**
- Americium (Am) - Atomic number 95
- Plutonium (Pu) - Atomic number 94
- Uranium (U) - Atomic number 92
- Neptunium (Np) - Atomic number 93

2. **Write the Electronic Configurations:**
- Americium (Am): [Rn] 5f^7 6d^0 7s^2
- Plutonium (Pu): [Rn] 5f^6 6d^0 7s^2
- Uranium (U): [Rn] 5f^3 6d^1 7s^2
- Neptunium (Np): [Rn] 5f^4 6d^1 7s^2

3. **Determine the Oxidation States of Each Actinoid:**
- **Americium (Am):** Shows oxidation states of +3, +4, +5, and +6. It does not show +7.
- **Plutonium (Pu):** Shows oxidation states of +3, +4, +5, +6, and +7. It does show +7.
- **Uranium (U):** Shows oxidation states of +3, +4, +5, and +6. It does not show +7.
- **Neptunium (Np):** Shows oxidation states of +3, +4, +5, +6, and +7. It does show +7.

4. **Conclusion:**
- The actinoids that show oxidation states up to +7 are Plutonium (Pu) and Neptunium (Np).

### Final Answer:
The actinoids that show oxidation states up to +7 are **Plutonium (Pu) and Neptunium (Np).**

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