What is the common oxidation state of Cu, Ag and Au ?

Explanation

To determine the common oxidation states of copper (Cu), silver (Ag), and gold (Au), we can analyze each element's typical oxidation states based on their chemical behavior.

### Step-by-Step Solution:

1. **Identify the Elements**: We are looking at three elements: Copper (Cu), Silver (Ag), and Gold (Au).

2. **Copper (Cu)**:
- Copper commonly exhibits two oxidation states: +1 and +2.
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