Answer the questions, with the help of the following: Hard solid Me

1.	Answer the questions, with the help of the following: Hard solid Melting point above 450 K. Four allotropic forms are known. Low electrical conductivity. Mass number! 31. Which is the element? 2. Write any two uses of this element. 4. Write any three compounds of this element.
Answer» 1. Boron 2. To increase hardness of steel As semiconductor in electric devices 3. 2B 4. Diborane, Borax, Boric acid

Answer the questions, with the help of the following: Hard solid Melting point above 450 K. Four allotropic forms are known. Low electrical conductivity. Mass number! 31. Which is the element? 2. Write any two uses of this element. 4. Write any three compounds of this element.

Answer»

1. Boron

2. To increase hardness of steel As semiconductor in electric devices

3. 2B

4. Diborane, Borax, Boric acid

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Answer the questions, with the help of the following: Hard solid Melting point above 450 K. Four allotropic forms are known. Low electrical conductivity. Mass number! 31. Which is the element? 2. Write any two uses of this element. 4. Write any three compounds of this element.

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