Answer :
The external structure of a solid refers to the overall structure of the solid due to the arrangement of its particles..
The internal structure of a solid is the the arrangement of unit particles in the internal space of the solid.
What is a solid?
A solid is a substance which has a definite shape and volume.
Solids are one of the three states of matter.
The particles in a solid are arrange in regular repeating patterns due to the strong intermolecular forces of attraction between the particles in the solid.
The external structure of a solid refers to the overall structure of the solid due to the arrangement of its particles.
The external structure of a solid may be a crystal or amorphous in shape.
The internal structure of a solid is the the arrangement of unit particles in the internal space of the solid.
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