5.) What is the missing element? *

a. Hydrogen
b. Helium
c. Boron
d. Oxygen

i want to say it is C

Explanation:

Explanation:

This question is showing a stoichiometric reaction.  But the out put is Helium and nitrogen.     while the input has Hydrogen and something else.  Hydrogen doesn't turn into different elements.  So I think the question is wrong.   But, He is missing , and so is the nitrogen, but since that's not a choice, maybe they hope you'll put  He   ??   :/  But like I said , the question is just wrong.

it may be wrong but i think its a

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