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When an element's atoms have different numbers of neutrons they are said to be isotopes of that element.Three isotopes of hydrogen have been described above.Most carbon consists of the isotopes carbon 12 and carbon 13, which are very stable.A very small percentage of carbon, however, consists of the isotope carbon 14, or radiocarbon, which is unstable.Because the ratio of carbon 12 to carbon 14 present in all living organisms is the same, and because the decay rate of carbon 14 is constant, the length of time that has passed since an organism has died can be calculated by comparing the ratio of carbon 12 to carbon 14 in its remains to the known ratio in living organisms. Our Living Language : In the late 1940s, American chemist Willard Libby developed a method for determining when the death of an organism had occurred.

Tintypes enjoyed their widest use during the 1860s and 1870s, but lesser use of the medium persisted into the early 20th century and it has been revived as a novelty in the 21st.Tintype portraits were at first usually made in a formal photographic studio, like daguerreotypes and other early types of photographs, but later they were most commonly made by photographers working in booths or the open air at fairs and carnivals, as well as by itinerant sidewalk photographers.Because the lacquered iron support (there is no actual tin used) was resilient and did not need drying, a tintype could be developed and fixed and handed to the customer only a few minutes after the picture had been taken.A rarer form of hydrogen known as deuterium has one proton and one neutron: its mass number is 2.A third form of hydrogen known as tritium has one proton and two neutrons: its mass number is 3.The tintype saw the Civil War come and go, documenting the individual soldier and horrific battle scenes.