Concoction

How does one come up with a concoction from which the planet in its current form comes into being? How are the elements created which then aggregate into an iron cored nuclear active globe with water on it and gasses surrounding it?  Where in space are the basic constituents or constituent that can become the 103 elements? What is the mechanism that causes, so called, empty space to transform into matter. The big bang is not and answer it is name given to the event of creation which, so called, scientist can't explain.  What caused the universe to come into existence and why is existence this and not something else.