What are poly atomic ions? Give two examples?

Explanation

### Step-by-Step Text Solution:

1. **Definition of Polyatomic Ions**:
- Polyatomic ions are ions that consist of two or more atoms bonded together, which carry a net positive or negative charge. This means that the total number of electrons does not equal the total number of protons in the group of atoms.

2. **Characteristics of Polyatomic Ions**:
- They can be made up of different types of atoms (e.g., nitrogen, oxygen, sulfur).
- They can have either a positive charge (cations) or a negative charge (anions).
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