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1 Alpha denotes the largest particle, and it penetrates the least. 2  Alpha particles carry a positive charge, beta particles carry a negative charge, and gamma rays are neutral. 3  An alpha particle is made up of two protons and two neutrons bound together.  Beta particles are high energy electrons.
Here are just a few examples of franciumâs decay paths: Francium-223 is the elementâs longest lived isotope. It has a half-life of 22 minutes. It can emit an alpha-particle (a helium nucleus) to form astatine-219 or a beta-particle to form radium-223. (A beta-particle is an electron which is emitted from a nucleus when a neutron converts to a proton.).