because matter has weight and occupy space
It's Atoms
I believe it is Democritus
particles
The Greek philosopher Democritus
It was the Greek philosopher Democritus who proposed the hypothesis that matter was composed of tiny indivisible particles. Democritus also wrote on mathematical topics like geometry. He was born in 460 B.C. and died in 370 B.C.
Everything in the universe is made up of matter - anything that has a mass and takes up space. Matter is composed of tiny particles called atoms.
Around 400 BC Democritus a Greek philosopher theorized that everything was composed of small indivisible particles he called atoms or "atomos".
Atoms, which are in turn composed of sub-atomic particles.
These particles are called atoms.
Fermion
Matter is made up of atoms.