« Simple english c01/Nucleus » : différence entre les versions

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* Alpha decay is when the atom shoots out a particle having two protons and two neutrons. This is essentially a Helium nucleus. The result is an element with atomic number two less than before. So for example if a Beryllium atom (atomic number 4) went through alpha decay it would become Helium (atomic number 2). Alpha decay happens when an atom is too big and needs to get rid of some mass.
 
* Beta decay is when a neutron turns into a proton or a proton turns into a neutron. In the first case the atom shoots out an electron, in the second case it is a positron (like an electron but with a positive charge). The end result is an element with one higher or one lower atomic number than before. Beta decay happens when an atom has either too many protons, or too many neutrons.