Carbon dating kids
Since you never really know which carbon atom you are using in calculations, you should use the average mass of an atom.
Bromine (Br), at atomic number 35, has a greater variety of isotopes. There are two main isotopes at 79 and 81, which average out to the 79.90amu value. While it won't change the average atomic mass, scientists have made bromine isotopes with masses from 68 to 97. As you move to higher atomic numbers in the periodic table, you will probably find even more isotopes for each element.
The loss of those neutrons is called radioactive decay. For carbon, the decay happens in a few thousand years (5,730 years).
Some elements take longer, and others have a decay that happens over a period of minutes.
In 1949, American chemist Willard Libby, who worked on the development of the atomic bomb, published the first set of radiocarbon dates.
Supernova remnants are responsible for seeding dust and gas clouds that give rise to a new generation of stars and planets.
We have already learned that ions are atoms that are either missing or have extra electrons. They are just a little different from every other atom of the same element. Electrons don't have much of a mass when compared to a neutron or proton.
Although relative dating can work well in certain areas, several problems arise.
Rodents, for example, can create havoc in a site by moving items from one context to another.
It makes the principles behind these things easy, simple and clear for everyone to understand.