To solve the question regarding Ne, Na⁺, and F⁻ having the same properties, we will analyze each species in terms of their atomic structure, specifically focusing on the number of electrons, protons, and nucleons.
### Step-by-Step Solution:
1. **Identify the Atomic Number and Electron Count of Neon (Ne)**:
- Neon (Ne) has an atomic number of 10.
- This means it has 10 protons and, in a neutral atom, also 10 electrons.
2. **Identify the Atomic Number and Electron Count of Sodium Ion (Na⁺)**:
- Sodium (Na) has an atomic number of 11.
- A Na⁺ ion indicates that it has lost one electron. Therefore, the number of electrons in Na⁺ is:
\[
11 \text{ (atomic number)} - 1 \text{ (lost electron)} = 10 \text{ electrons}
\]
- The number of protons remains 11.
3. **Identify the Atomic Number and Electron Count of Fluoride Ion (F⁻)**:
- Fluorine (F) has an atomic number of 9.
- A F⁻ ion indicates that it has gained one electron. Therefore, the number of electrons in F⁻ is:
\[
9 \text{ (atomic number)} + 1 \text{ (gained electron)} = 10 \text{ electrons}
\]
- The number of protons remains 9.
4. **Compare the Number of Electrons**:
- Ne: 10 electrons
- Na⁺: 10 electrons
- F⁻: 10 electrons
- All three species have the same number of electrons, which is 10.
5. **Determine the Mass Number (Number of Nucleons)**:
- The mass number is the sum of protons and neutrons.
- For Ne (atomic number 10), the most common isotope has 10 neutrons, so:
\[
\text{Mass number of Ne} = 10 \text{ protons} + 10 \text{ neutrons} = 20
\]
- For Na⁺ (atomic number 11), the most common isotope has 12 neutrons, so:
\[
\text{Mass number of Na⁺} = 11 \text{ protons} + 12 \text{ neutrons} = 23
\]
- For F⁻ (atomic number 9), the most common isotope has 10 neutrons, so:
\[
\text{Mass number of F⁻} = 9 \text{ protons} + 10 \text{ neutrons} = 19
\]
6. **Conclusion**:
- While Ne, Na⁺, and F⁻ have the same number of electrons (10), they do not have the same mass number or number of protons.
- Therefore, the correct answer is that Ne, Na⁺, and F⁻ are isoelectronic species, having the same number of electrons.
