A lot of people tend to narrowly focus on only Oxygen, Hydrogen, and carbon when considering the suitability for life. But the organic processes that we rely on require more elements than just those two, one of those often overlooked elements is Nitrogen.
In examining Venus for chemical suitability I noticed it only has like ~ %2 atmospheric Nitrogen concentration (from wiki). Where's all the Nitrogen?
My assumption is that there is a whole lot more trapped in liquid Nitric Acid or other acids or mineral deposits. If that is the case what is the estimated amount contained? If that is not the case, how did Earth end up with all the Nitrogen?