Q25 of 31 Page 198

Collect the information about reactivity of VIII A group elements (noble gases) from intend or from your school library and prepare a report on their special character when compared to other elements of periodic table.

i. Noble gases (group 18) are located in the far right of the periodic table.


ii. All the orbitals in the valence shell of the noble gases are completely filled.


iii. Noble gases neither have a tendency to lose or to gain electrons and hence do not enter into chemical combination.


iv. Thus, they are earlier called “inert gases” as they are exhibit very low chemical reactivity.


v. They have high ionization energies.


vi. Noble gases have large positive electron gain enthalpies.


vii. Boiling and melting points of noble gases are very low.


viii. The noble gases are liquefied with great difficulty.


ix. These gases are slightly soluble in water.


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