Members of which of the following have similar chemical properties?

Options

A. Isotopes
B. Isobars
C. Allotropes
D. Both Isotopes and Allotropes

Explanation

To determine which members have similar chemical properties, we need to understand the concepts of isotopes, isobars, and allotropes.

### Step-by-Step Solution:

1. **Understanding Chemical Properties**:
- Chemical properties are determined by the arrangement of electrons in an atom, particularly the outermost electrons (valence electrons). Atoms with the same number of valence electrons tend to exhibit similar chemical behaviors.

2. **Identifying Isotopes**:
- Isotopes are atoms of the same element that have the same atomic number (Z) but different mass numbers (A). This means they have the same number of protons but a different number of neutrons. Since they are the same element, they will have similar chemical properties.

3. **Identifying Isobars**:
- Isobars are atoms of different elements that have the same mass number (A) but different atomic numbers (Z). Since they are different elements, they will have different chemical properties.

4. **Identifying Allotropes**:
- Allotropes are different forms of the same element that exist in the same physical state but have different structures (e.g., graphite and diamond are both forms of carbon). They can have different chemical properties due to their different structures.

5. **Conclusion**:
- Since isotopes are atoms of the same element and have the same atomic number, they will exhibit similar chemical properties. Therefore, the members of isotopes have similar chemical properties.

### Final Answer:
The members of isotopes have similar chemical properties.

---