How old might the oldest hydrogen atom be? Explain. Are the oldest hydrogen atoms likely older than the oldest carbon, silicon, and oxygen atoms? Please explain second question as well.

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Hydrogen is the most abundant element in the universe, comprising about 75% of the universe's total chemical mass. The universe's hydrogen and helium were originally created beginning about three minutes after the Big Bang, in a ratio of about ten hydrogens to one helium, a balance which still exists today.This...

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Hydrogen is the most abundant element in the universe, comprising about 75% of the universe's total chemical mass. The universe's hydrogen and helium were originally created beginning about three minutes after the Big Bang, in a ratio of about ten hydrogens to one helium, a balance which still exists today.This means hydrogen atoms are around 13.7 billion years old.

Later on, hydrogen and helium atoms began to coalesce into clumps. Once enough atoms gathered, the clump's own gravity caused them to heat up as the atoms rubbed together; eventually the material ignited, and stars were formed. Stars have nuclear fusion reactions at their core, and this reaction can create other, heavier elements. When a star runs out of fuel and dies, these elements are spread out into space.  So carbon, silicon, oxygen, and all the other natural elements were created by stars, and are much younger (probably by several billion years) than hydrogen, which was created by the Big Bang.

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