Answer:
(BH3 follows the octet rule by dimerizing, as Hadi Kurniawan AR pointed out.) For H and He, an "octet" = 2 electrons. Boron does prefer to follow the octet rule, in that it likes to form borate compounds such as NaBH4. It also is happy to form compounds with elements with lone pairs.
Answer:
(NH4)2CO3 is the formula !
At the end of the reaction, the catalyst is UNCHANGED.
:)
Release less energy than it uses
A - Sulfur dioxide is an ion because it contains 2 or more elements, and it is a solid