What is the maximum covalency of oxygen ? Give examples.

Explanation

To determine the maximum covalency of oxygen and provide examples, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Covalency**: Covalency refers to the number of covalent bonds an atom can form. For oxygen, the typical covalency is 2, as it usually forms two bonds by sharing its two valence electrons.

2. **Limitations on Covalency**: The maximum covalency of an element is often influenced by its ability to utilize available orbitals for bonding. Oxygen lacks d orbitals in its valence shell (the second shell), which limits its ability to expand its valency beyond a certain point.

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