Timeline of Atomic Theory
by
alaina2k
Last updated 3 years ago
Discipline:
Science Subject:
Chemistry
Grade:
10


Timeline of Atomic Theory
Democritus400BC
J. J. Thomson1897AD
John Dalton1808AD
Ernest Rutherford1909AD
Neils Bohr1913AD
Robert Millikan1907AD
.
.
.
.
.
.
Atomic Theoryall atoms:-are small, hard particles-are made of a single material in different shapes and sizes-are always moving-create different materials by joining together
Atomic Theory -all matter is composed of atoms-atoms of all elements are the same size, mass, etc.-atoms of different elements are different -atoms cannot be divided
Discoveries-electron (Cathode Ray Experiment 1897)-plum pudding model (1904)-isotopes (1913)
Discoveries-protons are surrounded by negatively charged electrons-most of the atom is empty space-most of the mass is in the nucleus-the nucleus is made up of positively charged protons-Rutherford Model(Gold Foil Experiment 1909)
Discoveries-all electrons are negatively charged-proved Thomson's theory on the size of an atom(Oil Drop Experiment)
Discoveries-electrons move in specific layers (not randomly)-atoms absorb or give off energy when electrons move levels-Onion Model
There are no comments for this Glog.