1. Which of the following is NOT part of John Dalton's atomic theory?
   
   

AAll elements are composed of atoms.

BAll atoms of the same element have the same mass.

CAtoms contain subatomic particles.

DA compound contains atoms of more more than one element.

1. Who provided evidence for the existence of a nucleus in an atom?
   
   

AJohn Dalton

BJ. J Thomson

CDemocritus

DErnest Rutherford