Explain the different melting points between ionic and covalent bonding

Ionic bonding is formed in Ionic compounds due to electrostatic force between the oppositely charged ions.

In covalent bonds electrons are shared between the atoms. In case of ionic bond the bond is stronger as there is complete transfer of electrons from one ion to the other.

Since the ionic bonds are more difficult to break than the covalent bonds, ionic compounds have a higher melting point than covalent compounds.

Ionic compounds have high melting points than covelent compounds because ionic compounds have strong bonding which needs high amount of energy to break.

it's c. elements are placed in rows based on how may valencies electrons have.

1 is the answer to this problem