Norsk sexschat - Potassium 40 radioactive dating

The noble gases are sometimes called inert gases because Group 18 (VIIIA) elements react with very few other elements.

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The noble gases are the six elements in Group 18 (VIIIA) of the periodic table.

The periodic table is a chart that shows how the chemical elements are related to each other.

If there was a new group in the periodic table, where were the other elements that belonged in the group?

Fortunately, chemists had a good idea what these missing elements might look like.

These particles stick in the atoms and make them radioactive.

No radioactive isotopes of argon have any practical application.It can also be produced by heating nitrogen gas from the atmosphere with hot magnesium or calcium. Isotopes differ from each other according to their mass number.The magnesium or calcium combines with nitrogen to form a nitride: A little argon always occurs as an impurity with nitrogen. The number written to the right of the element's name is the mass number.It remains behind because it does not react with magnesium or calcium. When the natural gas is purified, some argon can be recovered as a by-product. The mass number represents the number of protons plus neutrons in the nucleus of an atom of the element. A radioactive isotope is one that breaks apart and gives off some form of radiation.The number of protons determines the element, but the number of neutrons in the atom of any one element can vary. Radioactive isotopes are produced when very small particles are fired at atoms.Argon is also used in making "neon" lamps and in lasers. However, English scientist Henry Cavendish (1731-1810) had predicted the existence of argon 200 years earlier.

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