An atom is 99.99999% empty. An object is made up of with atoms. If atoms are mostly empty space, why do object look solid?
The perception of objects appearing solid is due to the way that light interact with matter. When light waves come into contact with an object, they can be absorbed, reflected or transmitted through the material. The nature of this interaction depends on the physical properties of the material including its density and the arrangement of its atoms.
Even though atoms are mostly empty space, they still have a positive nucleus surrounded by negatively charged electrons. When light waves encounter an object, they interact with these charged particles, causing them to scatter and absorb some of the energy of the light. This interaction gives rise to the appearance of a solid object. Furthermore the human brain processes visual information in a way that creates the perception of solidity. Our brain interpret the scattered and absorbed light waves as evidence of a continuous, solid object, even though the object itself is made up of mostly empty space.
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