(a) What is the unique property of carbon atom? Hopw is this property helpful to us ?
(b) Explanin why , diamond is hard while graphite is soft (though both are made of carbon atoms).

Why is diamond hard while graphite is soft?

What is the state of hybridisation of carbon atoms in graphite ?

The unique property of carbon atom to form covalent bonds with other carbon atoms

Sudanshu made a model of the unit cell of diamond. It resembled the unit cell of ZnS. If the unit cell of ZnS has 4 units of ZnS per unit cell. It has the same packing efficiency as ZnS. But diamond is the hardest known substance. (a) What is the number of atoms of carbon per unit cell of diamond? (b) Why diamond is the hardest known substance? (c) What is the value that Sudanshu can derive from these facts?

(a) What is diamond ? Of what substance is diamond made? (b) Describe the structure of diamond . Draw a simple diagram to show the arrangement of carbon atoms in diamond. (c ) Explain why , diamond has a high melting point (d) State any tow uses of diamond.

(a) What is the atomic number of carbon . Write its electronic configuration. (b) what type of chemical bonds are formed by carbon? Why? (c ) Name the three allotropic forms of carbon.

What are the two properties of carbon which lead to the huge number of carbon compounds we see around us?