Answer: The two elements that most commonly fail to complete an octet are boron and aluminum; they both readily form compounds in which they have six valence electrons, rather than the usual eight predicted by the octet rule. So there is more than one and actually another.
Explanation:
Hydrogen, beryllium, and boron have too few electrons to form an octet. Hydrogen has only one valence electron and only one place to form a bond with another atom. Beryllium has only two valence atoms and can form only electron-pair bonds in two locations. Boron has three valence electrons.
Hope this helps! ^w^ sorry if it not what your looking for.
