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Elements radioactive

Elements, radioactive

chemical elements which spontaneously transmute into another element with corpuscular or electromagnetic radiation. The natural radioactive elements are all those with an atomic number above 83, and some other elements, such as potassium (atomic number 19) and rubidium (atomic number 7), which are very weakly radioactive.


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Newbie question about the first life

... chemical process but "physical chemistry", a rearrangement of elements involving both chemical and merely physical interactions, as in ... helped to put together (also UV radiation, radiation issuing from radioactive elements in exposed rocks and shock waves caused by lightning ...

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by piscilactovegetarian
Tue Feb 25, 2014 10:21 am
 
Forum: Molecular Biology
Topic: Newbie question about the first life
Replies: 14
Views: 8715

Re: Molecular gene (genome) concept scientifically untenable

... protons and 16 neutrons is the stable phosphorus nuclide, which is not radioactive. When the neutron number increases to 17 it becomes P-32 and ... called phosphorus because the criterion we adopt to distinguish between elements is the proton number. Both P-31 and P-32 have the same proton number, ...

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by PAWahid
Sat May 12, 2012 2:29 am
 
Forum: Molecular Biology
Topic: Molecular gene (genome) concept scientifically untenable
Replies: 12
Views: 27508

Re: How to Obtain Dinosaurs

... exposition of the cosmic rays, which supposes smaller synthesis of the radioactive C14, through which organic findings are date-defined. Just thought ... is used only as far back as 60 000 years; after that radio active elements with a longer half life are used...

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by Chroma
Tue Jan 05, 2010 9:33 pm
 
Forum: Evolution
Topic: How to Obtain Dinosaurs
Replies: 12
Views: 11883

How to Obtain Dinosaurs

... the Earth? Why is it forgotten that in percentage contents of chemical elements in the universe, hydrogen has total prevalence. And exactly our ... exposition of the cosmic rays, which supposes smaller synthesis of the radioactive C14, through which organic findings are date-defined. Oceans ...

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by enarees
Tue Jan 05, 2010 5:38 pm
 
Forum: Evolution
Topic: How to Obtain Dinosaurs
Replies: 12
Views: 11883

Re: Radiometric dating of rocks

... is in tact, then the minerals are also intact and unchanged. When a radioactive dated sample is taken, there are a few things to consider, if it is a clay pot, it has not been changed. With certain elements in the clay pot, they leave a time marker, as in zircon or other minerals. ...

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by MichaelXY
Wed Jun 03, 2009 8:15 am
 
Forum: General Discussion
Topic: Radiometric dating of rocks
Replies: 2
Views: 5452
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