The carbon atoms in diamond are held together by four covalent bonds, and the sheets of carbon atoms in graphite are held together by three covalent bonds.
A covalent bond is the sharing of one or more pairs of electrons between two atoms, thereby forming a bond.
The carbon atoms in diamond are held together by 4 covalent bonds with other carbon atoms, hence making it strong.
The carbon atoms in graphite are held together by three covalent bonds between the carbon atoms.
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