Most of the remaining atoms (1.11%) have 7 neutrons alongwith their 6 protons and are called carbon-13 atoms,...For the more unstable isotopes (the higher the atomic weight, themore unstable, generally speaking), the half-life can be as shortas a few seconds.this usually happens with large nuclei, which tend to be more unstable (radioactive) than smaller nuclei."The radioactive decay of any atom is associated with theemission of a charged particle (alpha or positive or negative beta)from or the capture of an electron by the nucleus." Nucleonics Fundamentals by David B. Radioactive decay is the spontaneous change or disintegration of anunstable atomic nucleus as it transforms itself to lose energy.Itdoes this by the release of either particulate radiation orelectromagnetic radiation, or both.
There is a change in mass, since an electron and an electron anti-neutrino is emitted, and also because the neutron changes into a proton, but the atomic mass number , per se, does..main types are alpha decay in which an alpha particle (made of 2 protons and 2 neutrons) is emitted, beta decay (the emission of a beta particle such as an electron), and gamma decay in which a high-energy gamma photon is emitted Everything has what is called a half-life, it is the time in which a substance, such as carbon halves in quantity.
This isotope has a half lifeof around 5...( Warning: This is a little long.
For a summary, scroll down to the bottom.) Depends on the kind of decay.
Carbonusually exists as the isotope C12 meaning that it has 6 protons and6 neutrons in its nucleus.
However, a small percentage of all Cexists as the radioactive C14 isotope.