Isaac Newton 

Isaac Newton and Robert Boyle, both 17th century physicists, laid the foundation of modern atomic theory. Newton described the attractive and repulsive forces of objects having some impact on pressure. Boyle actually defined this pressure within gases as the product of atomic forces.

Newton contributed to atomic theory through his systematic development of calculus-based object modeling concepts e.g. displacement, velocity, acceleration and energy, as well as gravity, uniform circular motion and angular momentum