Web Results

Nucleosynthesis - Wikipedia


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.

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, ...

Origin of the Elements


Aug 9, 2000 ... While the abundance of these more massive ("heavy", A > 4) elements seems quite low, it is important to remember that most of the atoms in our bodies and Earth ... The low-mass elements, hydrogen and helium, were produced in the ... more massive than <sup>4</sup>He were not made in the Big Bang because the ...

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 Only Three Heavy Elements In The Universe That Aren't Made ...


Jul 1, 2015 ... You see, the Universe starts off with hydrogen and helium, all stars ... In fact, you can't make the first of the heavier-than-helium elements in ...

Cosmic Evolution - Epoch 3 - Stellar Evolution


Most of these elements were discovered toward the end of the 18<sup>th</sup> century and throughout ... To some extent, modern nuclear physics has made real the dream of the ... While in a hydrogen atom, a single electron orbits a single proton, heavier .... heavier than hydrogen and helium as “heavy elements,” or simply “ heavies.”.

Why did the Universe start off with Hydrogen, Helium, and not much ...


Jul 5, 2013 ... Neutrons, as you'll remember, are slightly heavier than protons: by about 0.2%. As the Universe ..... Anyway, I made a Dutch translation of this article: .... about 92 percent of the atoms in the Universe were hydrogen. The rest ...

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 ...

How many times heavier is helium than hydrogen? - Quora


It depends if you are talking about the diatomic form of hydrogen or just hydrogen atoms. ... Why is Jupiter so heavy if it's made of hydrogen and helium?