In which state of matter do the particles have the least energy? 1.solid 2.liquid 3.gas 4.plasma

They have the least amount of energy in solid form.

A: Solid

When particles are in the solid state of matter, they move at an immensely slow pace since they are all packed closely together. When they are liquid, particles have no solid form, moving loosely. When in a gaseous state, the particles move to fast to take on any specific form. Finally, plasma is similar to gas, except it is made of positively and negatively particles. 

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