<P> Dalton proposed that each chemical element is composed of atoms of a single , unique type , and though they can not be altered or destroyed by chemical means , they can combine to form more complex structures ( chemical compounds ) . This marked the first truly scientific theory of the atom , since Dalton reached his conclusions by experimentation and examination of the results in an empirical fashion . </P>
<P> Dalton proposed that each chemical element is composed of atoms of a single , unique type , and though they can not be altered or destroyed by chemical means , they can combine to form more complex structures ( chemical compounds ) . This marked the first truly scientific theory of the atom , since Dalton reached his conclusions by experimentation and examination of the results in an empirical fashion . </P>
who combined the idea of elements with earlier theories of the atom
who combined the idea of elements with earlier theories of the atom
Dalton
Dalton