This positively charged nuclear particle has almost 2,000 times the mass of the negatively charged electron
The atom is the smallest part of an element that has ALL the properties of that 
element ... -subscript is the ATOMIC MASS NUMBER (A#) NUMBER OF 
PROTONS ... For an atom to be neutral the total positive charges in the nucleus 
from the ... the atom are almost 2,000 times large than an electron - therefore 
heavy particle... [DOC] [TLE] 4.3 The Nuclear Atom [PAR] posed that the negatively charged electrons were small particles held within a ... 
explain the deflections he observed, the mass and positive charge of an atom ... 
on this idea, he developed the nuclear theory of the atom, which has three basic 
...