Clearly state, what do you understand by the terms `:` mass number, nucleaons and nuclides?

Explanation

To answer the question regarding the terms mass number, nucleons, and nuclides, we can break down each term step by step.

### Step 1: Understanding Mass Number
- **Definition**: The mass number of an atom is the total number of protons and neutrons present in its nucleus. It is denoted by the symbol 'A'.
- **Formula**:
\[ \text{Mass Number (A)} = \text{Number of Protons (Z)} + \text{Number of Neutrons (N)} \]
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