Atomic Model
by
Mdawg7777777
Last updated 7 years ago
Discipline:
Science Subject:
Chemistry


1800
350 BC
RutherfordFounded gold foil experimentAlpha particals deflect at various anglesConcluded an atom is mostly open spaceElectons hold on by positive nucleusProtons are positively charged
1920
Aristotle says "empty space doesn't exist"
Democritus says "matter consists of invisible particals
400 BC
1930
Robert Millikan comes up with the charge of an electron.
JJ ThompsonDetermines charge-mass ratioidentifies first subatomic particalPlum-Pudding Model
1900
John Dalton Matter is composed of atoms.Atoms are indivisible.
Atomic Model TIMELINE
1900s
Atomic Model now
Henry Moseleyeach element contains unique nucleinumber of proton elementdeveloped atomic number
Atoms of given elements are identical.Atoms of different elements differ.
In the 1920s, the electron cloud model was descovered, made of protons, nutrons, and electrons.
ChadwickShowed that nucleus contained nuetronsNuetrons- no charge but has mass
Videohttp://www.youtube.com/watch?feature=player_detailpage&v=QbWKF9uDF7w
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