I am the universe on an atomic level currently I am going through a process called nuclear fusion. Nuclear fusion is an atomic reaction in which multiple atoms combine to create a single, more massive atom. In my case it is done with energy being that I am the only atom right now. This high amount of fusion creates heat and once my core of gets heated enough I will explode but for right now I remain an atom sized ball of energy.
It finally happened my core became super heated and I exploded releasing energy in every direction. However, I haven't released it evenly lets see what happens next.
The uneven spread of energy caused for an imbalance that attracted smaller clumps of energy to larger clumps of energy. Accompanied by other events this imbalance helped form the universe you know today.
Stars make just about every element in their lifetime but for this representation I have labeled some stars with a specific element each of these elements being instrumental to human life. Nuclear fusion creates all of the elements labeled within the stars. The nuclear fusion happening in stars is a bit different however once the star creates certain elements it creates iron which does not fuse causing the star to work harder and become super heated and explode releasing the elements. same explosion different circumstance.
The explosion of these starts are what released the elements into the universe . Giving the chance for those things to be inner atmosphere.