Which one of the following bonds produces a solid that reflects light in the visible region and whose electrical conductivity decreases with temperature and has high melting point?

Options

A. metalic bonding
B. van der Waal's bonding
C. ionic bonding k
D. covalent bonding

Answer

A

Explanation

Metallic bonding is formed due to attraction of valence (free) electrons with the positive ion cores. When visible light falls on a metalic crystal, some orbital electrons absorb energy and reach to excited state. They then return to their normal state, giving light of same frequency.