Which of the following is most likely to be the best conductor of electricity?

iodine
neon
silicon
lead

Option (d) is the correct answer.

Explanation:

Metals are the substances which have more number of electrons. It is due to the presence of valence electrons that metals are able to conduct electricity.

Iodine ans silicon being non-metals do not conduct electricity.

Whereas neon being a noble gas have completely filled shells. Therefore, it does not conduct electricity unless and until it is ionized.

On the other hand, lead being a metals is able to conduct electricity.

Thus, we can conclude that out of the given options lead is most likely to be the best conductor of electricity.