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atom stack

Democritus thought of atoms (atomos... etc)
aristotle said matter was continuous
1790 Joseph lois proust law of definite masses
law of definite masses masses of chemical substances combine in definite repeatable ratios when forming compounds
John Dalton heat envelope
jj thompson plum pudding
rutherford nuclear model
chadwick discovered nuetrons
Niels Bohr planetary model (electron energy levels)
quantum models e clouds orbit
orbitals quantum model
orbits planetary model
nuetrons biggest
different numbers of nuetrons isotopes
mass number protons+nuetrons
octet rule atom is happiest with 8 valence electrons
atomic mass mass of atom measured im AMU's
nuclear radiation emission of rays or particles from unstable nuclei
alpha particle 2 protons and 2 nuetrons (positively charged)
beta particle free electron (nuetron also changes to proton)
gamma rays em waves
half life how long it takes for a half of a sample to decay
Created by: pickleman792