The alkali metals form salt-like hydrides by direct synthesis at elevated temperatures. The thermal stability of these hydrides decreases in which of the following orders?
- A$NaH > LiH > KH > RbH > CsH$
- B$LiH > NaH > KH > RbH > CsH$
- C$CsH > RbH > KH > NaH > LiH$
- D$KH > NaH > LiH > CsH > RbH$
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