On the scale of an individual particle, such is not the case.

Because they were just a series of individual particles.

This allows the computer to hold information despite the instability of the individual particles.

Light is considered to be individual particles of energy called photons.

So long as you don't get down to the size of individual particles, Newton's laws work just fine.

This means that one can label and track each individual particle in a system.

This can be understood by looking at the orbits of individual particles.

When you get down to individual particles, no barrier is absolute.

This is a very tedious process, particularly when the individual particles are small.

Also, some laws apply to average effects but not individual particles.