The genesis of the first molecules !!

The universe has sudden radical transformations since its creation, over the years we were trying to uncover all kinds of different atoms and we have succeeded to discover 118 elements until now that we classified in the periodic table. But the question is: did all these simple entities exist from the very beginning of the cosmos? Were they part of the concentrated mass before the cosmic inflation? 

It all started a fraction of seconds after the big bang, a massively expanding cloud of gas was propagating and it only contained 2 kinds of primordial atoms which are Hydrogen about 75% and Helium (25%). However, some places were more concentrated with these atoms than others and according to the gravity law G=M*m/R² the more the area is concentrated the more the gravity force increases which leads to a further accumulation of raw atoms. Eventually, a large ball of concentrated gas forms.

The gas state is characterized by low density which means that the atoms can move freely, on the other hand, the solid-state is denser and atoms are completely bonded and as the large ball continues to shrink it becomes denser and denser, the pressure and heat increase sorely in the core which is submitted to a critical pressure  contrarily to the surface of the ball.

When the core becomes hot enough a nuclear fusion occurs: hydrogen atoms smash together to form helium, the reaction produces a significant amount of energy, high enough to counteract the shrinking force of the gravity.

When the energy pushing out from the fusion reaction s matches the gravity pulling all the gas inward, an equilibrium occurs. From this, a star is born !!

But that's not it, the fusion reactions continue during the star's lifetime and it's not limited only to the generation of helium but also carbon, nitrogen, oxygen... and all the other elements of the periodic table up to iron.The elements above Iron are heavier and the star fusion reactions aren't capable of generating such elements so how do you think they came?