Group 18 elements

Neon

Neon

________ is used in discharge tubes and fluorescent bulbs for displays.

Xenon

________ and Radon are the rarest elements of the group.

XeF2

________ has linear structure, XeF4 has square planar structure and XeF6 has distorted octahedral structure since it has 6 bonding pairs and a lone pair.

noble gases

All ________ have general electronic configuration ns2 np6 except helium which has ns2 configuration.

Neil Bartlett

________, at the University of British Columbia, noticed the reaction of a noble gas in March 1962.

helium

Group 18 consists of six elements: ________, neon, argon, krypton, xenon and radon.

XeO3

________ is a colorless explosive solid and has a pyramidal molecular structure.

XeF6

________ can also be synthesized by reaction between XeF4 and O2F2.

Argon

________ is used mainly to provide an inert atmosphere in high temperature.

Helium

_______ is used to produce superconducting magnets which form an essential part of modern NMR spectrometers and Magnetic Resonance Imaging (MRI) systems.

XeF4

XeF2, ________ and XeF6 are colorless crystalline solids.

fluorinating agents

They are powerful ________ and are hydrolyzed readily even in small traces of water.

Radon

________ is obtained in a radioactive decay.

Compounds of radon

________ have not been isolated but only identified (e.g., RnF2) by radiotracer technique.

Liquid helium

________ is used as cryogenic agent for carrying out various experiments at low temperatures.

volatile liquid

XeOF4 is a colorless ________ and has a square pyramidal molecular structure.

modern diving

It is used as a diluent for oxygen in ________ apparatus because of its very low solubility in blood.

noble gases

Since ________ have stable electronic configuration they have no tendency to accept an electron so they have high positive electron gain enthalpy.

Helium

________ has the lowest boiling point (4.2 K) of any known substance.

noble gases

All ________ except Radon are found in the atmosphere.

Helium

________ and Neon are also found in radioactive minerals.

noble gases

In general, ________ are least reactive.

Group 18 consists of six elements

helium, neon, argon, krypton, xenon and radon

Order of Atomic radii

Xe> Kr> Ar> Ne> He

Order of Ionization enthalpy

He> Ne> Ar> Kr> Xe> Rn

Order of electron gain enthalpy

Ne> Ar=Kr> Xe> Rn> He

He attempted to make the same type of compound using Xe and was successful in making another red color compound Xe+ PtF6

by combining PtF6 and xenon

Xenon

Fluorine Compounds

For example

2XeF2+2H2O→2Xe+4HF+O2