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The p-Block Elements
Question
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Why boron compounds such as BF3 are called electron deficient compounds?

Answer

In BF3 molecules three electrons of Boron and three electrons of fluorine combine to forms the compound. Since boron in its compounds does not have a complete octet (8 electrons).

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Some More Questions From The p-Block Elements Chapter

What is inorganic benzene? Write its formula. 

Name a hydride of boron which is used as reducing agent in organic chemistry. 

Does a molecule of BH3 exist?

What is relative stability of +1 oxidation state in group 13.

Are all the B-H bonds in diborane equivalent?

What is tincal ?

What is tau or banana bond?

Name two elements used as semiconductors in electronic devices.