Which of the following is/are true statement(s) regarding characteristic of hydrogen?
I. Hydrogen resembles alkali metals due to similar outer electronic configuration `(ns^1)`.
hydrogen is short by one electron to the corresponding noble gas configuration, helium `(1s^2)`.
Choose the correct option.

Options

A. Only I
B. I and II
C. Only II
D. None of these

Answer

To solve the question regarding the characteristics of hydrogen, we need to analyze the two statements provided:

**Statement I:** "Hydrogen resembles alkali metals due to similar outer electronic configuration `(ns^1)`."

1. **Understanding Hydrogen's Electronic Configuration:**
- Hydrogen has an atomic number of 1, which means it has one electron. The electronic configuration of hydrogen is `1s^1`.
- Alkali metals (like Lithium, Sodium, Potassium, etc.) have the general electronic configuration of `ns^1`, where `n` is the principal quantum number corresponding to the period they belong to. For example, Lithium (Li) has the configuration `1s^2 2s^1` and Sodium (Na) has `1s^2 2s^2 2p^6 3s^1`.

2. **Comparison with Alkali Metals:**
- Both hydrogen and alkali metals have one electron in their outermost shell, which allows them to lose that electron easily to form a unipositive ion (H⁺ for hydrogen and M⁺ for alkali metals).
- Therefore, this statement is **true**.

**Statement II:** "Hydrogen is short by one electron to the corresponding noble gas configuration helium `(1s^2)`."

1. **Understanding Noble Gas Configuration:**
- The noble gas configuration for helium is `1s^2`, which means helium has two electrons in its outer shell.
- Since hydrogen has only one electron (`1s^1`), it indeed is short by one electron compared to helium.

2. **Conclusion:**
- This statement is also **true**.

**Final Conclusion:**
Both statements I and II are true regarding the characteristics of hydrogen.

### Answer:
Both statements are true.