Why does common table salt (nacl) have a high melting point?
it forms an ionic bond with a crystal lattice structure.
it forms a covalent bond with a lewis dot structure.
it forms a metallic bond with an electron sea model structure.
it forms a covalent bond by sharing electrons.
it forms a metallic bond with a lewis dot structure.

It forms an ionic bond with a crystal lattice structure.

Explanation: In Sodium chloride

Electronic configuration of sodium:

Sodium atom will loose one electron to gain noble gas configuration and form sodium cation with +1 charge.

Electronic configuration of chlorine:

Chlorine atom will gain one electron to gain noble gas configuration and form chloride ion with -1 charge.

In sodium chloride the one electron from sodium metal gets transferred to chlorine atom and thus form an ionic bond. Ionic compounds have regular arrangement of atoms in a crystal lattice and thus have high melting point.