Observe the movement of the neon molecules in the chamber. Then, one at a time, select argon, oxygen, and water, and observe the movement of the atoms and molecules in the solid state. Do the same for the liquid and gas states. Identify each description of how the particles behave in a solid, liquid, or gas. Drag the tiles to the correct locations. Each tile may be used more than once.

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.

on passing the small ampere of electric current through the tube made of ar and hg of cfl generates uv rays which excites the fluorescent and thus emits the high radiation by consumption of just 5- 12 w in comparison to incandescent light which requires more power such as around 40 - 55 w to lighten.

moreover the life span of fluorescent or cfl is around 8000 h whereas the life span of incandescent is around 1200 h

hence, the building installed with incandescent lights bears more electricity bill.