gas: also known as passive gas, rare gases, noble gases [return] . About 0.94% of the atmosphere, most of it is argon, and the other components are very small, and because these gases are not active, they are called inert gases. Including: helium, neon (He) (Ne) (Ar), argon, krypton and xenon (Kr) (Xe), radon (Rn), is a single atom molecule colorless, odorless, gaseous. In the periodic table of elements into zeroth groups (group A, VIII) outer electrons have reached saturation, minimal activity.
There are six kinds of
inert gas, arranged in the order of increasing atomic weight, followed by helium, neon, argon, krypton, xenon and radon. In general, they are not combined with other elements, but exist only as single atoms form. In fact, these atoms are indifferent to the existence of other atoms in their own kind, and even do not want to be close to each other to the extent that they can form a liquid, so they will not be liquefied at room temperature. They’re all gases, and they’re in the air. Inert gas
the first found is argon, was detected in 1894. It is also the most common inert gas, accounting for 1% of the total atmosphere. Other inert gases are found only a few years later, and they are rarely found on the earth. When an atom to another atom or electron transfer and another atom sharing of electrons, they combine with each other. An inert gas would not do so, the reason is that the electrons in their atoms are perfectly symmetrical, and it is unlikely that they would have to enter a large energy to change their position.
helium in the atmosphere only a trace of existence, but when the radioactive elements such as uranium and thorium decay, can generate helium. This accumulation process takes place on the ground, and so on.