John+Dalton+pd+2

=John Dalton =



= = //**Year Model was Proposed:**// 1803 //**Nickname for this model:**// The Billard Ball Model

//**Description of Model:**// All matter is composed of atoms, cannot be made or destroyed, all atoms of the same element are identical, different elements have different types of atoms, chemical reactions occur when atoms are rearranged, compounds are formed from atoms of the constituent elements. // There was no specific atomic structure discovered. // // **How did this model build on the previous model?** Democritus proposed the idea that atoms make up all substances. Dalton's model helped Democritus discover that elements consisted of tiny solid particles that cannot be subdivided by atoms. //
 * Atomic structure/structures discovered by this model:**

General Science Book http://www.rsc.org/chemsoc/timeline//pages/1803.html Raquel Rich and Deja Henry