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

Options

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

Answer

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

### Step 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

### Step 2: Write the electronic configurations of the actinoids
- 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

### Step 3: Determine the possible oxidation states for each actinoid
- **Americium (Am)**: Can exhibit oxidation states of +3, +4, +5, +6.
- **Plutonium (Pu)**: Can exhibit oxidation states of +3, +4, +5, +6, +7.
- **Uranium (U)**: Can exhibit oxidation states of +3, +4, +5, +6.
- **Neptunium (Np)**: Can exhibit oxidation states of +3, +4, +5, +6, +7.

### Step 4: Identify which actinoids can show +7 oxidation state
From the analysis:
- Plutonium (Pu) shows oxidation states up to +7.
- Neptunium (Np) also shows oxidation states up to +7.

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

### Final Answer
The correct answer is **Plutonium (Pu) and Neptunium (Np)**.

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