No. The particles in a solid are not motionless. They have different types of motion, such as vibrational, rotational, etc. But they do move, just not as easily or as readily as they do in a liquid or a gas.
What type of sentence, or just a sentence in general? Here are a few examples of sentences with the word "motionless": The car was motionless in the driveway. The water in the ocean is motionless. A living person can not be completely motionless.
amorphous solids
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Crystalline Solids are when the particles form a regular repeating pattern. Amorphous solids have particles that are not arranged in a regular pattern.
The motion of particles in gasses, liquids, and solids are all different. Gas particles can move much more quickly than solids.
Most solids do not have an orderly arrangement of particles: these are non-crystalline solids.
Crystalline solids have particles that are arranged in a regular pattern and amorphous solids do not
Dust particles are solids.
Solids can be made up of atoms, molecules, or ions.
Network solids.
Solids are metals,plastics and logs.