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The average atomic mass for the element is actually 12.011.

Since you never really know which carbon atom you are using in calculations, you should use the average mass of an atom.

If you have looked at a periodic table, you may have noticed that the atomic mass of an element is rarely an even number. If you are an atom with an extra electron, it's no big deal.

As you learn more about chemistry, you will probably hear about carbon-14. C-14 is considered an isotope of the element carbon.

But if you're curious, that's where we proved the following formula.

That at any given point of time, if you have some decaying atom, some element, it can be described as the amount of element you have at any period of time is equal to the amount you started off with, times e to some constant-- in the last video I use lambda. And then for a particular element with a particular half-life you can just solve for the k, and then apply it to your problem.

Today it is being replaced by electron beam radiation therapy systems.

A third half-life will leave 12.5% of the mother and 87.5% daughter.The half-life of a radioactive substance is a characteristic constant.It measures the time it takes for a given amount of the substance to become reduced by half as a consequence of decay, and therefore, the emission of radiation.The ratios are consistent among species, and the slight (1-3%) differences can also be calculated from the ratio of C) decreases as the radiocarbon decays. Libby determined, one gram of pure carbon should produce about 14 (13.56) radioactive decays per minute. The Beta-counting method detects the rate at which purified carbon decays. A rate of 7 decays/gram/minute would indicate an age of one half-life, or 5730 years old.

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