What are isobars? Give examples.

Explanation

### Step-by-Step Solution:

1. **Definition of Isobars**:
- Isobars are defined as atoms of different elements that have the same atomic mass but different atomic numbers. This means that while the total number of nucleons (protons + neutrons) is the same, the number of protons (which defines the atomic number) is different.

2. **Understanding Atomic Mass and Atomic Number**:
- The atomic mass of an element is the total number of protons and neutrons in the nucleus.
- The atomic number is the number of protons in the nucleus, which also defines the element.
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