Which of these is not a characteristic of metals and their ability to form metallic bonds?

a)
conductivity

b)
ductility

c)
insulator

d)
malleability

The correct answer is C) insulator

Explanation:

The characteristics of metals consist of conductivity (for example of heat), malleability (deformation property) and ductility (stretching capacity).

The insulator is not a characteristic of metals and their ability to form metallic bonds.

C)  insulator

Explanation:

Atoms quickly lose electrons to form positive ions in metals. Further, the delocalized electrons that surround these ions are responsible for their conductivity. The electrostatic interactions between ions and the electron cloud are called the metallic bond.  

The physical properties include malleability, thermal, ductility, strength, opacity, conductivity, and luster. Malleability is the deformation property, and ductility is the stretching capacity of atoms in a metallic bond.

- lead + phosphoric acid = hydrogen + lead(ii) phosphate