1. Definite shape.
2. Bonds between particles are strongest.
3. Particles vibrate about a fixed position.
1. No definite shape.
2. Bonds between particles are less than in liquids.
3. Particles move about more freely (though randomly, and their movements are restricted).
Note that although the compressibility and volume of solids and liquids are properties, they're not included them, since they possess similar characteristics, and not differences.