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Question

Explain the following properties of group 16 elements:
(i) Electro negativity
(ii) Melting and boiling points
(iii) Metallic character
(iv) Allotropy


Solution

i) Electronegativity 
The electronegativity decreases as we move down the group. Therefore it decreases as we move from oxygen to polonium due to an increase in nuclear size

ii) melting & Boiling points
As the atomic size increases from oxygen to tellurium, the melting & boiling point also increase 

iii) metallic character 
metallic properties increase down the group. this is because $$e^\theta$$becomes easier to lose as atomic radius increase. oxygen & sulphur (Nonmetal).se& tellurium (metalloids) & polonium (metal)

(iv) Allotropy: Each one of the element of group 16 show allotropy 
oxygen has two allotropes 1) oxygen 2) ozone
Sulphur exists 1) Rhombic  sulphur 2) monoclinic sulphur
selenium & Tellurium in both amorphous & crystalline forms 

Chemistry

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