(1) Matter consists of separate, partless, solid, eternal, immutable, invisible and intangible unit-particles which are physically and theoretically indivisible atoms (the ‘uncuttable’);
(2) Atoms differ in shape (A from B), position (Z from N) and order (AN from NA) but not in quality;
(3) Empty space or void is necessary for their movement;
(4) Perceptible change and plurality are the result of the transfer of momentum by the moving atoms and such transfer occurs only by contact and not by distinct action.
(solid sphere model)