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What is physical behavior at nanoscale?
At this level of division of matter, the laws of classical physics do not predict all the effects observed. For example, the probabilistic quantum laws explain the tunnel effect that is the founder of nanotechnologies. Below 50 or 100 nm, properties such as hardness, elasticity, permeability, inflammability, conductivity, or color can be significantly altered.
The electron does not revolve around the nucleus as a satellite around the Earth. It is impossible to know precisely its position and its speed.
The Heisenberg uncertainty principle, and more generally, quantum physics explain that sometimes an electron crosses the energy barrier between two atoms.
For example, a lead bead of a few nanometers remains on the surface of the water because of surface tension.