Jin listed some common thermal insulators and conductors in a chart. a 2-column table with 2 rows. the first column labeled insulators has entries rubber, air. the second column labeled conductors has entries copper, x. which belongs in the area marked with an x? (iron) foam wood glass
a. iron

X is iron

Explanation:

A conductor is a substance that allows electricity to readily pass through it. The properties of substance determines if it is a conductor or not. Most metals for example are conductors due to the presence of free mobile electrons in their structures. Since the second column is for conductors and our choice is between iron, foam, wood and glass, iron is simply the correct option. Foam, wood and glass are all insulators which do not allow for electrical conduction.

water is used to store them because it would keep the radiation from getting out in the open and causing harm to the workers