Of be, be1+, be2+, and
be3+,which would have a line spectrum most similar to
that of hydrogenatom? explain your reasoning.

Be³⁺

Explanation:

Be³⁺ has only one electron since it has loss 3 electron and is therefore capable of having a line spectrum similar to hydrogen  atom.

space exploration has led to the development and technological improvement of many everyday items. (if this answer is wrong i will find the right answer) : )

thats how its supposed to be