The proportions of matter in the cosmos hydrogen has seventy percent by mass and 90 percent by number of atoms. Called
hydrogen atom, which is nothing more than a neutron decayed, behaves entirely differently from other atoms.
The deuterium atom should be considered first, by adding a neutron to the nucleus, but nuclear fusion not resist it destroyed, it is only a stepping stone to helium.
Animating a deuterium atom
Helium is really the first atom, corresponds to a stable composition, from which are shaped by successive atoms such as carbon that is stable on the scale below, that complies with three helios.
The following image shows the binding energy per nucleon for common isotopes. In helium this energy is significantly higher than in the adjacent nuclides.
At the core of helium lies the secret of the atom behavior of such strength that radioactive elements decay by helium nuclei.
Almost all the helium present in the earth is the result of radioactive decay as alpha particles expelled by this process.
Beryllium and lithium are unstable and resolved immediately after birth, in principle, the existing result from the decay of carbon
for the birth of helium are needed four hydrogens, so in 10 percent of helium is equal to forty percent of hydrogen from hydrogen nineties itself that makes up the total existence of the cosmos.
Each iron atom 52, hydrogen was invested, of course some more for the isotopes.
abundant in nebulae of dust and molecular material probably related analysis following the hydrogen will be in the minority.
As personally, not believe in a different starting point to the simple decomposition of neutron results in movement and therefore the heat that draws other neutrons, I consider that the existing hydrogen ratio is the balance, the atoms have a limited life span, from which decay occurs to finish resolving the hydrogen and then a new beginning in the eternal cyclical process.
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