Isotone differ in terms of ....and .....but have identical.....

Explanation

To solve the question regarding isotones, we need to understand the definitions and characteristics of isotones.

### Step-by-Step Solution:

1. **Definition of Isotones**: Isotones are defined as nuclides (nuclear species) that have the same number of neutrons but different numbers of protons (atomic number) and mass numbers.

2. **Difference in Terms**:
- **Atomic Number**: Isotones differ in their atomic number (Z), which is the number of protons in the nucleus of an atom. This means that isotones belong to different elements.
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