A hydride is a compound containing a hydride ion, ${{H}^{-}}$. Predict two elements whose hydrides would contain incomplete octets.

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Hint: Octet means electronic configuration of valence orbital having eight electrons. The elements that have lower atomic number cannot complete their octet while forming hydrides.

Octet rule states that the atoms combine to form compound in such a way that both contain 8 electrons in their valence shell- So, many elements like Sodium, Lithium, Beryllium makes hydrides and that are NaH, LiH and $Be{{H}_{2}}$ respectively.
- In $Be{{H}_{2}}$, Beryllium loses two electrons and gains a stable state containing a fully filled valence shell, the same case is here with hydrogen atoms also. Here also Beryllium ion has only two electrons in its valence shell. So we can say that it does not have octet structure.