Which of the following is a one electron species ?

Options

A. He
B. N
C. `H_(2)`
D. `N_(2)`

Explanation

To determine which of the given options is a one-electron species, we will analyze each option based on the number of electrons they contain.

### Step-by-Step Solution:

1. **Identify the Options**: The options provided are Helium, Nitrogen, H2+, and N2+.

2. **Analyze Helium**:
- Helium has an atomic number of 2.
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