Class notes
History and Structure of the Atom
- Course
- CHEM 1A
This is notes of the history and structure of the atom in a form of a timeline. It is organized by centuries woth some hand drawn visuals.
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STRUCTURE AND HISTORY OF ATOMSDURING ANCIENT TIMES
PEOPLE WERE AWARE OF :
-
·
LIGHT
·
LIGHTNING
·
STATIC
·
MAGNETITE
1700s
-
EARLY 1700s : SCIENTIFIC REVOLUTION
↳ PURSUIT OF NEW KNOWLEDGE BY CONDUCTING RESEARCH UNDER SCIENTIFIC METHOD
-
MID 1700s
↳ LIGHT WAS UNDERSTOOD AS A WAVE
-
MANY PROPERTIES COULD NOT BE EXPLAINED WITH WAVES
·
FOUNDATIONS OF BLACK BODY RADIATION AND OTHER PHENOMENA WERE STARTING TO
DEVELOP
THEN KNOWN ,THEN UNKNOWN
·
1800s GAS DISCHARGE TUBE
EARLY 1800s
& SUIT PRISM
AND MAGNETISM CAN INTERACT BUT ARE TWO SEPARATE THINGS
NESPECTION
I
↳ THOUGHT ELECTRICITY
1853
↳ THE STUDY OF SPECTRA FROM GAS DISCHARGE WAS IN EARLY STAGES
~
1878 -
↳ CATHODE RAY TUBE ICRT) WAS DEVELOPED TO UNDERSTAND ELECTRICAL DISCHARGES AND
NATURE OF MATTER
1875
↳ ELECTRICITY AND MAGNETISM ARE CONFIRMED TO BE THE REAL THING LIGHT ELECTRICITH MAGNETISM
-
VISIBLE LIGHT IS ELECTROMAGNETIC RADIATION 7 ↓
1887 ELECTROMAGNETIC RADIATION
↳ PHOTOELECTRIC EFFECT IS OBSERVED
-
CANNOT BE ACCURATELY DESCRIBED WITH WAVES
1898
↳ RUDBERGEQUATION IS DEVELOPED
2 =
R(nt - )
1895
↳ X-RAYS ARE DISCOVERED
1896 : RADIO ACTIVITY DISCOVERED
↳ URANIUM DISCOVERED TO PRODUCED AN UNKNOWN FORM OF RADIATION
THESE RAYS PENETRATED THROUGH BLACK PAPER WHEN X-RAYS COULD NOT
-
1897 THE ELECTRON -
↳
JJ THOMPSON PERFORMED EXPERIMENTS WITH CRTS;
CATHRODE RAYS (CRs) AFFECTED BY EXTERNAL MAGNETIC AND ELECTRIC FIELDS
-
-
CRs HAVE A TINY MASS-TO-CHARGERATIO
I
-
CRS ARE UNIQUE TING NEGATIVE PARTICLES EACH WITH THE SAME MASS AND CHARGE
-
NAME "ELECTRON" IS COINED
1899 : THE THREE RAYS
↳ RADIOACTIVITY SEPARATED INTO THREE TYPES OF RADIATION
-
LOW TO HIGH : ALPHARAY(C1) BETARAUS (B) , GAMMARAYS (y)
,
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