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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


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

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, ...

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 ...

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 .....



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.

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 ...

Cosmic Evolution - Epoch 3 - Stellar Evolution


Most of these elements were discovered toward the end of the 18<sup>th</sup> century and ... While in a hydrogen atom, a single electron orbits a single proton, heavier ... Having a few more or less neutrons than usual, isotopes play important roles in the ... these artificial (human-made) ones often decay into other elements quickly  ...

How did elements heavier than iron form given that iron is the end ...


Aug 28, 2013 ... AstronomyHow did elements heavier than iron form given that iron is the ... First off, people usually answer this question saying flat out "they were made in ... In some kind of super hot environment with lots of hydrogen, a rapid series of ..... It's also likely that once an atom gets really heavy (past uraniu...

Atoms - What are they? What's inside them? - Explain that Stuff


Apr 6, 2016 ... In ancient times, people thought atoms were the smallest possible ... All atoms are made from the same bits, which are called subatomic ... In other words, an atom of helium is four times heavier than an atom of hydrogen, ...

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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 ...

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.

If iron is the heaviest element made by nuclear fusion, then how do ...


Looking at this, we see that hydrogen and helium were primordial (though there was ... occurs when high-energy particles (i.e. "cosmic rays") hit heavy atoms and produce lighter atoms. ... All elements other than hydrogen are made by fusion.