The covalent bonds are formed when the bond between the metals when they share electrons. Thus statement A is correct.
- The covalent bonds are the strongest bond and the interaction between the covalent bond has resulted when the sharing of electrons takes place. The electrons have been shared between the atoms and result in the formation of a covalent bond. Thus statement A is correct.
- The metal atom sharing proton will not result in the formation of any bond, Thus statement B is incorrect.
- The sharing of electrons by nonmetal result in the formation of weaker ionic bonds. Thus statement C is incorrect.
- The nonmetal atom that share protons result in no bond formation. Thus statement D is incorrect.
So, the covalent bond formation has been most likely to take place when the metal atoms share electrons. Thus, statement A is correct.