Question

The force that binds a metal atom to a number of electrons within its sphere of influence is known as a metallic bond.
From the above mentioned statement which of these is false?

• A. Metallic bond is non-directional in nature.
• B. Metallic bonds are weaker than covalent bonds.
• C. Energy required to vaporise a mole of metal (say, copper) to the vapour state is larger than the energy required to vaporise a mole of a covalent substance (say, graphite)
• D. The valence electrons in a metallic bond are mobile.

Answer 1

The correct option is C Energy required to vaporise a mole of metal (say, copper) to the vapour state is larger than the energy required to vaporise a mole of a covalent substance (say, graphite)

Copper is metallic solid and forms metallic bonds while graphite is covalent solid and forms covalent bonds. As metallic bonds are weaker than covalent bonds so energy required to vaporise a mole of metallic solid to the vapour state is less than the energy required to vaporise a mole of a covalent substance.
Metallic bonds are non-directional since electrons are shared with all the surrounding atoms in all directions.