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Nucleosynthesis is the process that creates new atomic nuclei from pre-existing nucleons, primarily protons and neutrons. The first nuclei were formed about three minutes after the Big Bang, through...

Atoms heavier than hydrogen were made by what - Answers.com


Atoms that are heavier than hydrogen were made by nuclear fusion after the big bang. Initially, only the lightest element, hydrogen, was present.

Stellar Nucleosynthesis - Astronomy Notes


Jun 8, 2010 ... All of the atoms on the Earth except hydrogen and most of the helium are ... made of carbon atoms, hydrogen atoms, and oxygen atoms (C6H12O6). ... The atoms heavier than helium up to the iron and nickel atoms were made ...

If elements heavier than hydrogen were/are only created through ...


If elements heavier than hydrogen were/are only created through star fusion and .... star that did not allow even protons and neutrons to exist, let alone atoms. ... If iron is the heaviest element made by nuclear fusion, then how do we have so ...

The Origin of The Elements


Sep 10, 2004 ... Hydrogen is the simplest possible atom by definition, one proton and one ... the universe was also expanding, and the chances of collision were getting smaller. ... Elements heavier than iron are made in such explosions.



Their relative abundance (by weight) was 75% hydrogen and 25% helium. ... Second, the atoms were becoming packed more tightly, increasing the density, ... (lower temperature and pressure) than the carbon-nitrogen-oxygen cycle. ... the temperature and density to reach levels where C nuclei can fuse into heavier nuclei.

How are light and heavy elements formed? (Advanced) - Curious ...


Jun 27, 2015 ... The lightest elements (hydrogen, helium, deuterium, lithium) were produced ... In stars less massive than the Sun, this is the only reaction that takes place. ... ( Intermediate) · Why will fusion wait until hydrogen is gone before starting to fuse heavier atoms? ... (Advanced) · Was the Sun made in a super...

NOVA - Official Website | The Star In You - PBS


Dec 2, 2010 ... Just what do astronomers mean when they say we're all made of star stuff ... All except atoms of hydrogen and one or two of the next lightest elements. They were formed even earlier, shortly after the Big Bang began 13.7 billion years ago. .... But stars do form elements heavier than iron, including cherished .....

E=mc^2 - Nuclear Fusion - Energy from Squeezing Atoms Together


For example, it had been calculated that if the Sun was made of coal it would use up .... Fusion is possible in atoms other than hydrogen and helium. ... For iron, and all heavier atoms, we need to put more energy in than we get back out .... For these reasons, nuclear weapons tests were eventually carried out under ground,  ...

BBC - GCSE Bitesize: Fusion in stars


Nuclear fusion involves two atomic nuclei joining to make a large nucleus. Energy is released ... A hyrdogen-1 nucleus is made of 1 proton. This can combine ... Heavier elements than hydrogen and helium (up to iron) are formed. Elements ...

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What were atoms heavier than helium were made by - Answers.com


Thermonuclear fusion. ... Is a lead atom heavier than a helium atom? ... Atoms that are heavier than hydrogen were made by nuclear fusion after the big bang.

How elements are formed | Sciencelearn Hub


Oct 22, 2009 ... An element is a pure substance made of atoms that are all of the same type. ... ' Big Bang', only the lightest elements were formed – hydrogen and helium ... which allows elements heavier than iron, such as uranium and gold, ...

Anything with an atomic number greater than 92 - Science ...


An answer to the question: How are elements heavier than uranium created? ... We generally call the transuranics "man-made" elements because they are normally not ... of how many neutrons it has) is hydrogen, an atom with two protons is helium, etc. ... Earlier, we said uranium and other heavy atoms were fissionable.