Molecule which follows octet rule

Options

A. `CIO_(2)`
B. NO
C. `NO_(2)`
D. `N_(2)O_(3)`

Answer

To determine which molecule follows the octet rule, we need to analyze the valence electrons of each atom in the molecule and see if they achieve a total of 8 electrons in their outermost shell.

### Step-by-Step Solution:

1. **Understanding the Octet Rule**: The octet rule states that atoms tend to form bonds in a way that gives them 8 electrons in their valence shell, achieving a noble gas configuration.

2. **Analyzing ClO2 (Chlorine Dioxide)**:
- Chlorine (Cl) is in group 17 and has 7 valence electrons.
- Each Oxygen (O) is in group 16 and has 6 valence electrons.
- Total for ClO2:
- Cl: 7 electrons
- O1: 6 electrons
- O2: 6 electrons
- Total = 7 + 6 + 6 = 19 electrons
- Chlorine has 11 electrons around it (after bonding), which does not satisfy the octet rule.

3. **Analyzing NO (Nitric Oxide)**:
- Nitrogen (N) is in group 15 and has 5 valence electrons.
- Oxygen (O) has 6 valence electrons.
- Total for NO:
- N: 5 electrons
- O: 6 electrons
- Total = 5 + 6 = 11 electrons
- Nitrogen has 7 electrons around it after bonding, which does not satisfy the octet rule.

4. **Analyzing NO2 (Nitrogen Dioxide)**:
- Nitrogen (N) has 5 valence electrons.
- Each Oxygen (O) has 6 valence electrons.
- Total for NO2:
- N: 5 electrons
- O1: 6 electrons
- O2: 6 electrons
- Total = 5 + 6 + 6 = 17 electrons
- Nitrogen has 9 electrons around it after bonding, which does not satisfy the octet rule.

5. **Analyzing N2O3 (Dinitrogen Trioxide)**:
- Each Nitrogen (N) has 5 valence electrons.
- Each Oxygen (O) has 6 valence electrons.
- Total for N2O3:
- N1: 5 electrons
- N2: 5 electrons
- O1: 6 electrons
- O2: 6 electrons
- O3: 6 electrons
- Total = 5 + 5 + 6 + 6 + 6 = 28 electrons
- Each atom:
- Each O has 8 electrons around it.
- Each N has 8 electrons around it.
- All atoms satisfy the octet rule.

6. **Conclusion**: The molecule that follows the octet rule is **N2O3** because all atoms in this molecule have 8 electrons in their outermost shell.