How did hydrogen become the major component of our Sun?

Love the show; devote follower for years (and I envy your podcast ratings).  

I'm confused by the formation of our solar system:

If a supernova left materials for our existence; what helped bring hydrogen and not other materials to the center of our system to form a new sun?  Clarified: if all of the diverse elements were equally spread out in our system pre-formation, what separated hydrogen to be more prevalent in the future sun center for a new sun to form without all of the heavier elements- with these I would think a sun would collapse... so how did they separate?

Thanks for the clarification.  I also listen to Naked Astronomy- if my question is sent there I'm a-ok.

Kyle Prawel