1 \u2013 The noble gases are a group of elements in the periodic table. They are located to the far right of the periodic table and make up the eighteenth column.<\/p>\n\n\n\n
2 \u2013 The elements that make up the family of noble gases include helium , neon , argon , krypton , xenon , and radon.<\/p>\n\n\n\n
3 \u2013 Helium has two electrons in its outer shell and the rest have eight electrons.<\/p>\n\n\n\n
4 \u2013 Because of their full outer shells , they are very inert and stable. This means they don\u2019t tend to react with other elements to form compounds.<\/p>\n\n\n\n
5 \u2013 They are gases under standard conditions.<\/p>\n\n\n\n
6 \u2013 They are colorless and odorless.<\/p>\n\n\n\n
7 \u2013 Nitrogen makes up about 78% of Earth\u2019s atmosphere and oxygen 21% , meaning that these two elements constitute fully 99% of the air above the Earth. Argon ranks a distant third , with 0.93%.<\/p>\n\n\n\n
8 \u2013 The remaining 0.07% is made up on water vapor , carbon dioxide , ozone (O3), and traces of the noble gases. These are present in such small quantities that the figures for them are not typically presented as percentages , but rather in terms of parts per million (ppm). The concentrations of neon , helium , krypton , and xenon in the atmosphere are 18 , 5 , 1 , and 0.09 ppm respectively.<\/p>\n\n\n\n
9 \u2013 Collectively , they make up about 1 percent of Earth\u2019s atmosphere.<\/p>\n\n\n\n
10 \u2013 The most important chemical property of the noble gases is their lack of reactivity. Helium , neon , and argon do not combine with any other elements to form compounds.<\/p>\n\n\n\n