P - Block Elements
Elements and Compounds of Group-18
- Zero group of periodic table includes gaseous elements, He, Ne, Ar, Kr, Xe and a radioactive element radon (Rn). These elements are characterised by ns2 np6 general electronic configuration.
- On having very stable electronic configuration in their valency shell they are chemically inert and are known as inert gases (or) noble gases.
- Argon is most abundant of all noble gases in the atmosphere.
- CP/CV ratio of these gases is 1.67. This shows that all these gases are mono atomic in nature.
- The different noble gases are absorbed by coconut charcoal at different temperatures. It provides a mean to separate these gases from one another.
- The ease of liquefaction increases with increase in atomic number i.e from He to Rn because vander waal's attraction increases in same order.
- Helium is used in helium thermometer for measuring extremely low temperatures.
- Neon is used widely in preparing neon signals in many electronic appliances.
Colour change and Neon glass tube
|S.No||Types of mixture||Types of glass tube||Colour of the light produced|
|2||Neon||light red||deep red|
|4||Ne, Ar, Hg vapours||Colourless||Light blue|
|5||Ne, Ar, Hg vapours||Purple||dark blue|
|6||Ne, Ar, Hg vapours||green||Light green|
- Argon is mainly used in filling electrical lamps.
- Krypton is used in filling luminous sign tubes and filament lamps.
- Radon is used in the preparation of ointments for treatment of cancer.
- The xenon fluorides are useful fluorinating agents.
Stable compounds of Xe
|Compound||Oxidation state of Xe||Hybridization||No.of lone pair of electrons||Shape|
|XeF6||+6||sp3d3||1||Distorted pentagonal bipyramidal|
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