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chapter 4 (the atom scientists (Democritus (theory of atomist, oldest),…
chapter 4
the atom scientists
Robert Millikan
oil drop
John Dalton
the existence of atom
Ernest Rutherford
the tiny electrons
Democritus
theory of atomist
oldest
James Chadwick
he had the discover of neutron in the late 1930s
j.j Thomson
electron by experimenting with a crookes.
parts of the atom
nucleus
protons
very big
the number of neutrons in the the nucleus
electrons
very small
atom math
% isotope x mass isotope 1 + % isotope4 2 x mass isotope 2
neutrons
very big
protons and neutrons have the same atomic number
the atomic number is one above
mass number
the total number of protons and neutrons in a nucleus.