How to determine the most covalent compound among different compounds?

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if the difference of electronegative of two atom is less than 2.1 and they have high electron affinity then compound is covalent. on this basis we can find most covalent compound among different compound
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Answers

2014-04-19T11:32:58+05:30
By seeing the color
thats alll
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2014-04-19T12:45:58+05:30
They cannot break into ions thus they do not conduct electricity,heat,etc
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