False statement for H atom -

Options

A. It resembles halogens in some properties
B. It resembles alkali metals in some property
C. It can not be placed `I^(st)` group in table
D. It can be placed in `17^(th)` group of periodic table

Answer

To solve the question of identifying the false statement regarding the hydrogen atom, we will analyze each of the provided statements step by step.

### Step 1: Analyze the first statement
**Statement:** "It resembles halogens in some properties."

- **Explanation:** Halogens are elements in Group 17 of the periodic table, which include fluorine, chlorine, bromine, iodine, and astatine. Halogens have seven valence electrons and tend to gain one electron to achieve a stable electronic configuration. Hydrogen has one electron and can also gain one electron to achieve a stable configuration (similar to the noble gas helium). Therefore, hydrogen does resemble halogens in some properties.

**Conclusion:** This statement is **true**.

### Step 2: Analyze the second statement
**Statement:** "It resembles alkali metals in some properties."

- **Explanation:** Alkali metals are found in Group 1 of the periodic table and include lithium, sodium, potassium, rubidium, cesium, and francium. These elements have one valence electron in their outermost shell (s orbital). Hydrogen also has one valence electron in its 1s orbital. Thus, hydrogen shares similarities with alkali metals in terms of having one valence electron.

**Conclusion:** This statement is **true**.

### Step 3: Analyze the third statement
**Statement:** "It cannot be placed in the first group of the periodic table."

- **Explanation:** The first group of the periodic table consists of alkali metals, which have one valence electron. Since hydrogen also has one valence electron, it can be placed in the first group. Therefore, this statement is incorrect.

**Conclusion:** This statement is **false**.

### Step 4: Analyze the fourth statement
**Statement:** "It can be placed in the 17th group of the periodic table."

- **Explanation:** As previously discussed, hydrogen can gain one electron to achieve a stable electronic configuration, similar to halogens in Group 17. Therefore, it can indeed be placed in that group based on its ability to gain an electron.

**Conclusion:** This statement is **true**.

### Final Conclusion
The false statement regarding the hydrogen atom is: **"It cannot be placed in the first group of the periodic table."**

### Summary of the False Statement
- **False Statement:** "It cannot be placed in the first group of the periodic table."

---