Primordial Radionuclides - First Unstable Atoms - How They Formed?

Question

All secondary radionuclides can be traced back to the following: 238U, 232Th and 235U, which were all created when the universe began, correct?

And all cosmogenic isotopes are the by-products of natural activity (cosmic rays, natural processes, etc.), correct?

So basically, the universe began with only 3 (barring 40K and 87Rb, which are non-series) unstable atoms?

How exactly did these unstable atoms form? I've always assumed that nuclear and chemical reactions proceed towards stability of the components.

Was the energy which made these nuclear reactions possible produced by the Big Bang, star-formation, etc?

Answer 1

You have been misinformed.

The early universe had practically no - none - zero - heavy elements. The first stars were made from hydrogen and helium. When they aged enough, they supernova-ed [what is the verb form?], which created heavy elements. Since a supernova is not an equilibrium process, the nucular reactions could extend pass iron to created U, Th, and the others.

Answer 2

Actually we don't really know.

If you compare the "Big Bang" to a supernova, then there would have to be heavy elements as well as light ones.

Remember, a supernova results from a star that can no longer fuse any more atoms (the core turned into iron and you can't fuse iron) when its over a specific size.

Answer 3

It is my personal belief that after the Big Bang, all atoms were Hydrogen, and through the immense pressures of stars/supernovae they re-formed into the much heavier elements such as U235.

Answer 4

"which, in accordance to the theory, drew at the same time, compacted and then exploded" i'm not a cosmologist, yet i understand adequate on the subject of the huge bang sort to understand that despite you in simple terms suggested is nonsense. some flaws: * the huge bang replaced into not an explosion * the huge bang sort does not say something a pair of "primordial dirt cloud" that "drew at the same time." i assume from this question which you have not any formal training on cosmology or astronomy. you are able to probable rectify that throughout the previous making stupid claims approximately which you have limited know-how approximately.