Answer:
Covalent bond
Explanation:
Ionic bond: It is that type of bond which is formed between two atoms by loss or gain of electrons.
Ionic bond is formed between metal and non- metal atom.
Covalent bond: It is that type of bond which is formed by sharing of electrons. It is formed between two non- metal atoms.
Ionic bond is stronger than the covalent bond due to coulombic attraction of oppositely charged ions.
Material with covalent bond tend to be more easily scratched because the molecules can easily be pulled away from each other in covalent bond.
Answer: Covalent bond