A sample of iodine is easiest to ship as a powder because it is , making it easy to break into small pieces. Helium is less than the elements that make up the air we breathe, so a balloon filled with helium will float in air. Plastic is a compound of nonmetallic elements, so its properties make it a popular coating for electric wires to prevent the current from escaping. a= b= c=

The answer is "brittle,  dense, and electrically insulating"

Explanation:

An iodine sampling frame is cheaper to transport as a powder because it is fragile, simple for individual bits to break.

The helium gas becomes less dense than for the air components for developers inbreathe, thus a helium gas was filled balloon floats throughout the air.

The plastic is the chemical compound of the non-metallic compound, in which it makes a popular layering for electrical cables to prevent unnecessary fleeing the flow.

the temperature of the gas, in k, not celsius.