`SiF_(6)^(2-)` exist but not `CF_(6)^(2-)` explain why ?

Explanation

To explain why \( SiF_6^{2-} \) exists but \( CF_6^{2-} \) does not, we can break down the reasoning into several steps:

### Step 1: Understand the Electronic Configuration
- **Silicon (Si)** has an atomic number of 14. Its electronic configuration is:
\[ 1s^2 \, 2s^2 \, 2p^6 \, 3s^2 \, 3p^2 \]
- **Carbon (C)** has an atomic number of 6. Its electronic configuration is:
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