Noble Gases

Noble gases are the inert gases that are classified into the elements in Group 18 of the modern periodic table. All the noble gases have very similar properties under standard conditions; they are odorless, colorless, nonflammable, monatomic gases with a very low chemical reactivity.

There are six naturally occurring noble gases, namely as follow. Helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe) and Radio active Radon (Ra), these gases have no known isotopes.

These gases are inert because they donít have the tendency to react with any other elements naturally, hence the name Noble Gases. Their valency is zero which means that their valence is fully fulfilled and so they basically remain chemically inactive.

The similarities in characters of noble gases can be derived from their basic atomic structure and electronic configuration. The noble gases are basically inactive because of their full valence electron shell. Only a few hundred noble gas compounds have been prepared till today.

The melting and boiling points for each noble gas are very much close together. The lighter gases such as Helium is more stable and so no electron can be easily removed from its outer shell, whereas the heavier and radio active gas radon is less stable and one or more electrons can be removed from its outer shell.

Noble gases have several important industrial applications such as lighting, welding and even in space and under water exploration. Argon is used to fill in the filament bulbs; Helium is used to inflate the tyres of a large aircraft, to fill air ships and weather balloons and is used with oxygen for under water respiratory apparatus, Neon is filled in smaller bulbs which are used in advertisements that turn red when electricity passes through it, Krypton and Xenon are used in photographic flash units, in stroboscopic lamps that are made use in light houses.

Article Written by Wonay Ali [320 Words]
Posted on Oct 12, 2013 with Views.

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