Short Constructive Response
The atom, molecule, and particle of Sodium Chloride are important because they are each a part of the white substance. The atom holds the basic parts, and the molecule is made out of the atom, which with the particle builds up the element itself(like oxygen). If you add an element's particle with another elements particle you will get a different substance(Sodium plus Chloride equals Sodium Chloride). And that is how atoms, molecules, and particles work together.
Sodium Chloride's Significance in the World
Sodium Chloride's significance in the world is as table salt, a meat preserver and food flavor giver. Wars were fought over it. Sodium Chloride is very important in the world.