Carbon 14 dating denotes the amount of

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The atomic number of an element never changes, meaning that the number of protons in the nucleus of every atom in an element is always the same.

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All carbon atoms, and only carbon atoms, contain six protons and have an atomic number of 6.

Oxygen atoms contain 8 protons and have an atomic number of 8.

Carbon-14, for example, decays into nitrogen-14, a stable species.

There are many different types of radioactive decay, so we won't cover them here.

Before the advent of carbon 14 dating, estimate of age is a rather hazardous undertaking.

The age of a piece of antique can be determined by its style in certain period, the age of fossil is related to the stratification etc.

Neutrons, on the other hand, have no charge and are therefore neutral. Neutrons and protons are added to together to get what is called the atomic mass. So if we add the amount of protons and neutrons together of carbon, we should get twelve right? If you look at carbon on the Periodic Table, under the "C" symbol, we see 12.01. For many of the elements on the periodic table, the amount of neutrons matches the amount of protons.

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The number of protons in the nucleus of an atom determines an element's atomic number.

For example, if we had a huge block of carbon-14 sitting in our living room, aside from it being dangerous, half of this block will decay into nitrogen in 5,730 years according to How Stuff Works. It may seem kind of far-fetched so let's work through an example.

To date living things, or things made from living things, biologists, archeologists and anthropologists use carbon-14.

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