Marie curie was the founder of the field of nuclear chemistry she was fascinated by antoinehenri becquerels discovery that uranium minerals can emit rays that are able to expose photographic film even if the mineral is wrapped in black paper.
thorium is a weakly radioactive metallic chemical element with symbol th and atomic number 90 thorium is silvery and tarnishes black when it is exposed to air forming thorium dioxide it is moderately hard malleable and has a high melting pointthorium is an electropositive actinide whose chemistry is dominated by the 4 oxidation state it is quite reactive and can ignite in air when.
To fully understand gentrys hypothesis a basic background in geology mineralogy and radiation physics is helpful the boxes on the next few pages present a.
isotope vs nuclide a nuclide is a species of an atom with a specific number of protons and neutrons in the nucleus for example carbon13 with 6 protons and 7 neutrons the nuclide concept referring to individual nuclear species emphasizes nuclear properties over chemical properties whereas the isotope concept grouping all atoms of each element emphasizes chemical over nuclear.
How radiometric dating works in general radioactive elements decay gradually into other elements the original element is called the parent and the result of.
Articles home page creation vs evolution 0 introduction and table of contents the following is an organized presentation on the creation vs evolution controversy.