Hydrogen mainly resembles halogens in the property

Options

A. It contains one electron only in valency shell
B. It is short of one electron to get inert gas configuration
C. It is a diatomic gas like all halogens
D. It exhibits color like halogens

Answer

To determine the property in which hydrogen mainly resembles halogens, let's analyze the options step by step.

### Step 1: Analyze the first option
**Option 1: It contains one electron only in valence shell.**
- Hydrogen has an atomic number of 1, which means it has 1 electron. This electron is in its valence shell.
- Halogens, such as chlorine (Cl) and fluorine (F), have 7 valence electrons.
- Therefore, hydrogen does resemble halogens in that it has one electron in its valence shell, but halogens have more.

**Conclusion for Option 1:** This option is true, but it does not fully capture the resemblance since halogens have more valence electrons.

### Step 2: Analyze the second option
**Option 2: It is worth 1 electron to get noble gas configuration.**
- Hydrogen can gain one electron to achieve the electron configuration of helium (which is 1s²).
- Halogens need to gain one electron to complete their octet and achieve the noble gas configuration of neon (for example, Cl needs one more electron to become Cl⁻).
- Thus, both hydrogen and halogens are one electron short of achieving a stable noble gas configuration.

**Conclusion for Option 2:** This option is correct as both hydrogen and halogens have a tendency to gain one electron.

### Step 3: Analyze the third option
**Option 3: It is a diatomic gas like halogen.**
- Hydrogen exists as H₂, which is indeed a diatomic molecule.
- Halogens also exist as diatomic molecules (e.g., F₂, Cl₂, Br₂, I₂).
- However, while hydrogen is a colorless gas, halogens exhibit various colors (e.g., Cl₂ is greenish-yellow, Br₂ is red-brown).

**Conclusion for Option 3:** This option is partially correct in terms of being diatomic, but incorrect in terms of color properties.

### Step 4: Analyze the fourth option
**Option 4: (Assuming a fourth option exists, but not provided in the transcript)**
- Since there is no fourth option mentioned in the transcript, we cannot analyze it.

### Final Conclusion:
From the analysis, the properties in which hydrogen mainly resembles halogens are:
- **Option 2**: It is worth 1 electron to get noble gas configuration.