Which one is a set of isolectronic species ?

Options

A. `N_(2), CO_(2), CN^(-)`
B. `N, H_(2)S, CO`
C. `N_(2), CO, CN^(-)`
D. `Ca, Mg, Cl`

Explanation

To determine which set of species are isolectronic, we need to understand what isolectronic species are. Isolectronic species are atoms, ions, or molecules that have the same number of electrons.

### Step-by-Step Solution:

1. **Identify the Options**:
First, we need to look at the options provided in the question. Typically, options will include different atoms or ions.

2. **Count the Electrons**:
For each species in the options, count the total number of electrons. This can be done by looking at the atomic number (for neutral atoms) or adjusting for the charge (subtracting for positive charges and adding for negative charges).

- For example, if you have Na⁺ (sodium ion), which has an atomic number of 11, it has 10 electrons (11 - 1 = 10).
- If you have O²⁻ (oxide ion), which has an atomic number of 8, it has 10 electrons (8 + 2 = 10).

3. **Compare the Electron Counts**:
After counting the electrons for each species in the options, compare them to see if any sets have the same number of electrons.

4. **Identify the Isolectronic Set**:
The set of species that has the same number of electrons is the isolectronic set.

5. **Final Answer**:
Write down the identified isolectronic species.

### Example:
Suppose the options are:
- A) Na⁺, Ne, F⁻
- B) O²⁻, N³⁻, C⁴⁻
- C) Cl⁻, Ar, K⁺
- D) Mg²⁺, Al³⁺, Si⁴⁻

1. **Count Electrons**:
- A) Na⁺ (10), Ne (10), F⁻ (10) → All have 10 electrons.
- B) O²⁻ (10), N³⁻ (10), C⁴⁻ (10) → All have 10 electrons.
- C) Cl⁻ (18), Ar (18), K⁺ (18) → All have 18 electrons.
- D) Mg²⁺ (10), Al³⁺ (10), Si⁴⁻ (10) → All have 10 electrons.

2. **Identify Isolectronic Sets**:
A, B, C, and D all have isolectronic species.