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Chapter 4 - Nicholas Delor (Atom Scientists (J.J Thompson (Discovered the…
Chapter 4 - Nicholas Delor
Atom Scientists
J.J Thompson
Discovered the first subatomic particle, the electron.
Robert Millikan
Discovered the charge of the electron.
John Dalton
Known for creating Dalton's Atomic Theory.
Ernest Rutherford
Discovered the nuclear nature of atoms.
Democritus
Created an atomic theory for the universe.
James Chadwick
Discovered the neutron.
Atomic/Mass Number
The number of protons is equal to the number of electrons.
Average Atomic Mass rounded to the nearest whole number.
MN= of Protons + # of Neutrons
Parts of the Atom
Nucleus
Protons
Atomic Number is number of protons in the nucleus.
Very big
Positive particle (o+)
Neutrons
Neutral (n0)
Very big
Atom Math
Protons = MN - Neutrons
Neutrons = MN - Protons
MN # of Protons + # of Neutron
Electron Cloud
Electrons
Very small
Negative (o-)
Ions vs. Isotopes
Ions
An Atom/Molecule with a net electric charge due to loss or gain of one or more electrons..
Isotopes
Contains an equal number of protons but a different number of neutrons.
How are they different?
While Isotopes still contain electrons, Ions lose them.