Which of the following are isoelectronic with one another?

Options

A. `Na^(+) and Ne`
B. `K^(+) and O`
C. Ne and O
D. `Ne and O`

Answer

To determine which of the given options are isoelectronic with one another, we need to understand the concept of isoelectronic species. Isoelectronic species are atoms or ions that have the same number of electrons.

### Step-by-Step Solution:

1. **Identify the Atomic Numbers:**
- Sodium (Na) has an atomic number of 11.
- Neon (Ne) has an atomic number of 10.
- Potassium (K) has an atomic number of 19.
- Oxygen (O) has an atomic number of 8.

2. **Calculate the Number of Electrons for Each Option:**
- **Option 1: Sodium ion (Na⁺) and Neon (Ne)**
- Sodium ion (Na⁺) has lost one electron: 11 - 1 = 10 electrons.
- Neon (Ne) has 10 electrons.
- **Conclusion:** Na⁺ and Ne are isoelectronic (both have 10 electrons).

- **Option 2: Potassium ion (K⁺) and Oxygen (O)**
- Potassium ion (K⁺) has lost one electron: 19 - 1 = 18 electrons.
- Oxygen (O) has 8 electrons.
- **Conclusion:** K⁺ and O are not isoelectronic (K⁺ has 18 electrons, O has 8).

- **Option 3: Neon (Ne) and Oxygen (O)**
- Neon (Ne) has 10 electrons.
- Oxygen (O) has 8 electrons.
- **Conclusion:** Ne and O are not isoelectronic.

- **Option 4: Neon (Ne) and Oxygen (O)**
- This option is the same as Option 3.
- **Conclusion:** Ne and O are not isoelectronic.

3. **Final Conclusion:**
- The only pair that is isoelectronic is **Option 1: Sodium ion (Na⁺) and Neon (Ne)**.

### Final Answer:
**The correct option is Option 1: Sodium ion (Na⁺) and Neon (Ne) are isoelectronic with one another.**

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