Is physicality emergent from the number of bonded atoms, intermolecular bonds, or the overall size?

Before you say there isn't a quantum/classical boundary ..show me viruses with fringes in the double slit.

It might be a fourth option, the total mass energy of the object. It would be simple to add a new constant if this is the case. We just need to start with viruses and go smaller and smaller until we detect fringes.

This mass energy constant would be what is required to bend the fabric of spacetime ..aka, to have gravity.