question 14 of 29 which of the following solids is the best insulator? a. magnesium fluoride b. magnesium c…

Brief Explanations:

Metals like magnesium, gold, and iron are good conductors due to the presence of free - moving electrons. Magnesium fluoride is an ionic compound and is a poor conductor of heat and electricity compared to metals, making it a better insulator.

Answer:

A. Magnesium fluoride