explain why atoms move at different speeds depending on whether they are liquid or solid

Atoms move at different speeds in solids and liquids...
Reason:
The reason is in liquids intermolecular space is more as compared to solids so atoms have more space to move and collide freely with each other... while in the solids atoms are compactly arranged so they do not have space to move freely so speed of atoms in liquids is more than in solids:)

atoms move at different speeds in solids and liquids ..reason :the
reason is in liquids intermolecular space is more as compared to solids
so atoms have more space to move and collide freely with each other
..while in the solids atoms are compactly arranged so they do not have
space to move freely so speed of atoms in liquids is more than in solids
:)