Answer: Option (c) is the correct answer.
Explanation:
Thermal conductivity is defined as the ability of a substance to transfer heat.
Also, it is known that metals are good conductors of heat and electricity. Therefore, they show high thermal conductivity.
Whereas non-metals are bad conductors of heat and electricity. Hence, they have poor thermal conductivity. Therefore, antimony and carbon will have less thermal conductivity.
On the other hand, thermal conductivity value of sodium is 140 W/(m k) and gallium is 29 W/(m k).
Thus, we can conclude that out of the given options sodium element is likely to have the highest thermal conductivity.
