Answer: covalent
Explanation:
Non-polar covalent bond is defined as the bond which is formed when there is no difference of electronegativities between the atoms. It is also defined as the bond which is formed due to the equal sharing of electrons between the atoms.
Ionic bond is formed when there is complete transfer of electron from one atom to another atom.
Hydrogen bond is formed between hydrogen and one of the electronegative elements.
Metallic bond is formed by the valence electrons of the metals.
