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In 1832 it was investigated and an investigation was made in which it was explained that there was a difference in the weight of the nitrogen synthesized in the laboratory and the nitrogen obtained from the air, once the other components were isolated. Ten years later, in 1904, Sir William Ramsay himself won the Nobel Prize in Chemistry for the discovery of "noble gases" such as argon, neon, xenon or krypton. Years later, I discovered that the argument already exists a different explanation so that nitrogen has a different density than other gases.

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He was curious about the observation that density of nitrogen extracted from the air was always greater than nitrogen released from various chemical compounds.

Then he looked for an unknown gas with greater density, then called it argon. Next he discovered helium, and suggested a new group if elements.

He suggested it because he see that they weren't (at all) metallic and according to the direction of metallic elements and the atomic number ordered them in the periodic table.

Science History Institute (2017) William Ramsey. Retrieved from https://www.sciencehistory.org/historical-profile/william-ramsay.

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Noble gases are a set of chemical elements with similar characteristics. They are located in group 18 (VIIIA) 1 of the periodic table.

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The noble gases are helium, argon, neon, xenon, krypton and the radioactive radon.

Under normal conditions, they are odourless, colourless monoatomic gases with very low chemical reactivity.