The number of lone pairs and bond pairs present on `Xe` of `XeO_3`, molecule

Options

A. 1,3
B. 1,6
C. 4,3
D. 6,1

Answer

To determine the number of lone pairs and bond pairs present on xenon (Xe) in the molecule xenon trioxide (XeO₃), we can follow these steps:

### Step 1: Identify the central atom and its valence electrons
- **Central Atom**: In XeO₃, xenon (Xe) is the central atom.
- **Valence Electrons**: Xenon is in group 18 of the periodic table, which means it has 8 valence electrons.

### Step 2: Determine the number of oxygen atoms and their bonding
- **Oxygen Atoms**: There are 3 oxygen atoms in XeO₃.
- **Bonds with Oxygen**: Each oxygen atom forms a double bond with xenon. Therefore, there are 3 double bonds.

### Step 3: Calculate the total number of bonding electrons
- **Bonding Electrons**: Each double bond consists of 4 electrons (2 pairs). Thus, for 3 double bonds:
\[ 3 \text{ double bonds} \times 4 \text{ electrons} = 12 \text{ bonding electrons} \]

### Step 4: Determine the number of lone pairs
- **Total Electrons**: Xenon starts with 8 valence electrons.
- **Used Electrons**: 12 electrons are used for bonding (from the 3 double bonds).
- **Remaining Electrons**: The total number of electrons used (12) exceeds the valence electrons (8), indicating that some electrons are coming from the oxygen atoms.

### Step 5: Calculate the number of lone pairs on xenon
- **Lone Pairs Calculation**: After forming 3 double bonds, we can calculate the remaining electrons:
- Each double bond uses 2 of Xe's electrons, so:
\[ 3 \text{ double bonds} \times 2 \text{ electrons} = 6 \text{ electrons used from Xe} \]
- Remaining electrons on Xe:
\[ 8 \text{ (total)} - 6 \text{ (used)} = 2 \text{ electrons} \]
- These 2 electrons form 1 lone pair.

### Step 6: Count the bond pairs
- **Bond Pairs**: Since there are 3 double bonds, the number of bond pairs is:
\[ 3 \text{ bond pairs} \]

### Conclusion
- **Lone Pairs**: 1
- **Bond Pairs**: 3

Thus, the final answer is:
- **Lone Pairs**: 1
- **Bond Pairs**: 3

### Final Answer
The number of lone pairs and bond pairs present on Xe in XeO₃ is **1 lone pair and 3 bond pairs**.

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