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chapter 4 STEPHEN TUMMONDS (The Atoms Scientist (Democritus, John Dalton,…
chapter 4
STEPHEN TUMMONDS
The Atoms Scientist
Democritus
John Dalton
J.J. Thomson discovered electrons
Robert Millikan oil drop experiment
Ernest Rutherford gold foil experiment
James Chadwick Discovered the neutrons
Parts of the Atoms
Electron Cloud
Very small
Mass of the electrons(s) does not add a significant value to the overall mass of the atom since it is so small
Nucleus
Protons
very big
P+
Neutrons
round
Very big
=
Number of Neutrons = Mass Number - Atomic Number ( Number Of Protons )
Atom Math
Mass Number = Protons + Neutrons
Number Of Neutrons = Mass Number - Atomic Number ( Number Of Protons )
Mass Number
Average Atomic Number rounded to the nearest whole number Take the Average Atomic Mass and round to the nearest WHOLE number (NO DECIMAL)
Mass # = Protons + Neutrons
Mass Number is the total number of protons and neutrons is an atom
.0435(49.946) + .83740(51.941) + .09500(52.941) + .02360(53.939) = 51.996 amu