Members of which of the following have similar chemical properties?

Options

A. isotope
B. isobars
C. allotropes
D. both isotopes and allotropes

Answer

To determine which members have similar chemical properties, we need to analyze the relationship between atomic number, electronic configuration, and chemical behavior.

### Step-by-Step Solution:

1. **Understanding Chemical Properties**:
- Chemical properties of elements are largely determined by their electronic configuration. Elements with similar electronic configurations tend to exhibit similar chemical properties.

2. **Identifying Electronic Configuration**:
- The electronic configuration of an element is determined by the number of electrons it has, which is equal to its atomic number. Therefore, elements with the same atomic number will have the same electronic configuration.

3. **Isotopes and Their Properties**:
- Isotopes are elements that have the same atomic number but different mass numbers. Since they have the same atomic number, they have the same electronic configuration and thus exhibit similar chemical properties. For example, hydrogen has three isotopes: protium (mass number 1), deuterium (mass number 2), and tritium (mass number 3). All have the same atomic number (1) and similar chemical properties.

4. **Isobars and Their Properties**:
- Isobars are elements that have the same mass number but different atomic numbers. Since their atomic numbers are different, they have different electronic configurations and therefore do not exhibit similar chemical properties.

5. **Conclusion**:
- Based on the above analysis, members of a group that have the same atomic number (isotopes) will have similar chemical properties.

### Final Answer:
Members of isotopes have similar chemical properties because they have the same atomic number.

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