Throughout the nineteenth century, some scientists had cautioned the evidence in support of atoms was indirect, and therefore atoms might not actually be real, only seem to be real.
😊 Atomic theory is the scientific theory matter is composed of particles called atoms.
😊Shortly after 1850, certain physicists developed the kinetic theory of gases and of heat, which mathematically modelled the behavior of gases by assuming they were made of particles.
😊Ancient Greek philosophers called these hypothetical ultimate particles of matter atomos, a word which meant “uncut”.
😊The term elementary particle is now usual to refer to particles are actually indivisible.
😊An atom is now defined as the basic particle composes a chemical element.
😊Atomic theory traces its origins to an ancient philosophical tradition familiar as atomism.
Source:
[1] Wikipedia Contributors. “Atomic Theory.” Wikipedia, Wikimedia Foundation, 4 Nov. 2020, en.wikipedia.org/wiki/Atomic_theory. Accessed 6 Nov. 2020.
[2] andreas160578. “Atom Chemistry Molecular – Free Photo on Pixabay.” Pixabay.Com, 18 Apr. 2016, pixabay.com/photos/atom-chemistry-molecular-physics-1331961/. Accessed 6 Nov. 2020.