Molecular shape of `SF_(4), CF_(4)` and `XeF_(4)` are

Options

A. the same with 2, 0 and 1 lone pairs of electrons respectively
B. the same with 1, 1 and 1 lone pairs of electrons respectively
C. different with 0, 1 and 2 lone pairs of electrons respectively
D. different with 1, 0 and 2 lone pairs of electrons respectively.

Answer

To determine the molecular shapes of SF4, CF4, and XeF4, we will follow these steps:

### Step 1: Determine the electronic configuration and hybridization of SF4
1. **Electronic Configuration of Sulfur (S)**: The electronic configuration of sulfur is 1s² 2s² 2p⁶ 3s² 3p⁴.
2. **Excited State Configuration**: In the excited state, one electron from the 3p orbital is promoted to the 3d orbital. This gives us:
- 3s: 2 electrons
- 3p: 3 electrons (3p³)
- 3d: 1 electron (3d¹)
3. **Hybridization**: The hybridization is sp³d, which indicates that there are 5 regions of electron density (4 bonds with fluorine and 1 lone pair).
4. **Molecular Shape**: With one lone pair, the molecular shape of SF4 is **seesaw**.

### Step 2: Determine the electronic configuration and hybridization of CF4
1. **Electronic Configuration of Carbon (C)**: The electronic configuration of carbon is 1s² 2s² 2p².
2. **Excited State Configuration**: In the excited state, one electron from the 2s orbital is promoted to the 2p orbital. This gives us:
- 2s: 1 electron (2s¹)
- 2p: 3 electrons (2p³)
3. **Hybridization**: The hybridization is sp³, indicating 4 regions of electron density (4 bonds with fluorine and 0 lone pairs).
4. **Molecular Shape**: With zero lone pairs, the molecular shape of CF4 is **tetrahedral**.

### Step 3: Determine the electronic configuration and hybridization of XeF4
1. **Electronic Configuration of Xenon (Xe)**: The electronic configuration of xenon is 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 4p⁶.
2. **Excited State Configuration**: In the excited state, two electrons from the 4p orbital are promoted to the 4d orbital. This gives us:
- 4s: 2 electrons
- 4p: 2 electrons (4p²)
- 4d: 2 electrons (4d²)
3. **Hybridization**: The hybridization is sp³d², indicating 6 regions of electron density (4 bonds with fluorine and 2 lone pairs).
4. **Molecular Shape**: With two lone pairs, the molecular shape of XeF4 is **square planar**.

### Summary of Molecular Shapes
- **SF4**: Seesaw shape (1 lone pair)
- **CF4**: Tetrahedral shape (0 lone pairs)
- **XeF4**: Square planar shape (2 lone pairs)