The spectrum of `He` is expected to be similar to that of

Options

A. H
B. Na
C. `Li^(+)`
D. `He^(+)`

Explanation

To determine the spectrum of helium (He) and what it is expected to be similar to, we need to analyze the electronic configuration of helium and compare it with other elements or ions.

### Step-by-Step Solution:

1. **Identify the Electronic Configuration of Helium (He)**:
- Helium has an atomic number of 2, which means it has 2 electrons.
- The electronic configuration of helium is \(1s^2\).

2. **Consider the Helium Ion (He\(^+\))**:
- The helium ion (He\(^+\)) has lost one electron, resulting in only one electron remaining.
- The electronic configuration of He\(^+\) is \(1s^1\).

3. **Compare with Hydrogen (H)**:
- Hydrogen has an atomic number of 1 and an electronic configuration of \(1s^1\).
- Since both He\(^+\) and H have the same electronic configuration (\(1s^1\)), their spectra will be similar.

4. **Conclusion**:
- The spectrum of helium (when considering He\(^+\)) is expected to be similar to that of hydrogen due to the similarity in their electronic configurations.

### Final Answer:
The spectrum of He is expected to be similar to that of hydrogen (H).