matter is composed of atoms The simplest atom is the hydrogen atom whose nucleus contains one proton and zero neutrons.
Atoms are elementary particles because they are composed of electrons that revolve around a core like Panet around the sun and can not be split.
Except for hydrogen, which everyone else in the nucleus even neutrons. The amount of protons and neutrons contained in the nucleus determines the type of item or atomo.Questo number can be up to a maximum of 118 elements with a number of neutrons equal to or greater.
The largest nucleus of the atom exists in nature is uranium which contains 92 protons and 146 scientists neutroni.Secondo 90% of the Universe are hydrogen atoms and only the remaining 10% contains , in different proportions, the other 117 atoms, some of which are extremely rare. When atoms combine to form chains of different sizes, you get a molecule.
Before the stars were born, in the space is only the simpler molecules and the hydrogen molecule is the most common and consists of two hydrogen atoms joined together. 
It is found in the enormous gas clouds that give birth to stars
"It 's a giant cloud, much larger than those in heaven, and is composed of tiny particles. The particles are so numerous that the cloud is huge, so big that it would be possible stuffing them with millions and millions of planets similar to Earth. innumerable stars will be born from this cloud ."... The secret key to the universe.
Lucy & Stephen Hawking
Oscar Mondadori
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