This occurs when valence electrons are transferred between atoms. Characteristics of ionic bonding are solubility, high melting point, and conductivity as a liquid and dissolved in water.
This occurs when electrons are shared between atoms. Characteristics of covalent bonding are low melting point and no conductivity.
This occurs when electrons are shared freely between metals. Characteristics of metallic bonding are insolubility, high conductivity, a shiny appearance, and high melting point.