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.

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-

a polar bond is formed when electrons are shared unevenly between atoms