Editing Carbon group (section)

====Isotopes====
There are 15 known [[isotopes of carbon]]. Of these, three are naturally occurring. The most common is [[stable isotope|stable]] [[carbon-12]], followed by stable [[carbon-13]].<ref name="Table"/> [[Carbon-14]] is a natural radioactive isotope with a half-life of 5,730 years.<ref name = "Nature's Building Blocks"/>

23 [[isotopes of silicon]] have been discovered. Five of these are naturally occurring. The most common is stable silicon-28, followed by stable silicon-29 and stable silicon-30. Silicon-32 is a radioactive isotope that occurs naturally as a result of radioactive decay of [[actinides]], and via [[spallation]] in the upper atmosphere. Silicon-34 also occurs naturally as the result of radioactive decay of actinides.<ref name = "Nature's Building Blocks"/>

32 [[isotopes of germanium]] have been discovered. Five of these are naturally occurring. The most common is the stable germanium-74, followed by stable germanium-72, stable germanium-70, and stable germanium-73. Germanium-76 is a [[primordial nuclide|primordial radioisotope]].<ref name = "Nature's Building Blocks"/>

40 [[isotopes of tin]] have been discovered. 14 of these occur in nature. The most common is tin-120, followed by tin-118, tin-116, tin-119, tin-117, tin-124, tin-122, tin-112, and tin-114: all of these are stable. Tin also has four radioisotopes that occur as the result of the radioactive decay of uranium. These isotopes are tin-121, tin-123, tin-125, and tin-126.<ref name = "Nature's Building Blocks"/>

38 [[isotopes of lead]] have been discovered. 9 of these are naturally occurring. The most common isotope is lead-208, followed by lead-206, lead-207, and lead-204: all of these are stable. 5 isotopes of lead occur from the radioactive decay of uranium and thorium. These isotopes are lead-209, lead-210, lead-211, lead-212 and lead-214.<ref name = "Nature's Building Blocks"/>

6 [[isotopes of flerovium]] (flerovium-284, flerovium-285, flerovium-286, flerovium-287, flerovium-288, and flerovium-289) have been discovered, all from human synthesis. Flerovium's most stable isotope is flerovium-289, which has a half-life of 2.6 seconds.<ref name = "Nature's Building Blocks"/>