Adapt Posted:

Furthermore the universe will continue to expand and expand forever. Eventually it will reach a state where there is like one electron in a thousand mile radius. So essentially all matter will be stripped down to its most primitive parts. After a while that pencil on your desk becomes the collection of atoms floating in various points in space with nothing special to attribute to them because they are just atoms.

It goes beyond the level of atoms too – all atoms have some non-zero chance of decaying into their component particles. The half-life on most non-radioactive elements is insanely long, but in the infinite reaches of time even the long-lived hydrogen atom will break down. Then those constituent particles eventually decay too, until they reach the elementary particles.