Coinage metals are

Options

A. Normal metals
B. Transition metals
C. Active metals
D. Highly electropositive

Answer

**Step-by-Step Solution:**

1. **Definition of Coinage Metals**: Coinage metals refer to a specific group of metals that are primarily used in making coins and jewelry due to their desirable properties such as resistance to corrosion and excellent conductivity.

2. **Identification of Coinage Metals**: The primary coinage metals are:
- Copper (Cu)
- Silver (Ag)
- Gold (Au)

3. **Group Classification**: These metals belong to Group 11 of the periodic table, which is also known as the coinage group.

4. **Electronic Configuration**: The electronic configurations of these metals are as follows:
- Copper (Cu): [Ar] 3d^10 4s^1
- Silver (Ag): [Kr] 4d^10 5s^1
- Gold (Au): [Xe] 4f^14 5d^10 6s^1

5. **Transition Metals**: Coinage metals are also classified as transition metals. Transition metals are defined as elements that have partially filled d orbitals in their most stable oxidation states.

6. **Oxidation States**: Although the electronic configurations of copper, silver, and gold show fully filled d orbitals, their most common oxidation states (e.g., Cu^2+ has the configuration [Ar] 3d^9) indicate that they can exhibit partially filled d orbitals, thus qualifying them as transition metals.

7. **Conclusion**: Therefore, the coinage metals are copper, silver, and gold, which are classified under Group 11 of the periodic table and are also considered transition metals due to their ability to exhibit partially filled d orbitals in certain oxidation states.

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