Which is the correct thermal stability order for () ?

Question

Which is the correct thermal stability order for  () ?

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🧠 The Bond-Length Principle
Thermal stability is essentially a measure of how hard it is to break a bond with heat. For Group 16 hydrides (), this depends on the strength of the  bond.

🗺️ The Group 16 Trend
1. Atomic Size: As you move down the group (), the size of the central atom () increases.
2. Bond Length: A larger central atom means a longer  bond.
3. Bond Strength: Longer bonds are significantly easier to break (lower bond dissociation enthalpy).
4. Thermal Stability: Therefore, therma

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