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Atomic Theory
By Kylee and Caitlin
Democrates- 600 B.C.
»All matter is made up of atoms
Aerostatale 500 BC.
»Matter=Atoms
»Learned multiple elements are
an atom
»Matter made up of 4 elements
1700/1800s
Same elements
No mass +/-
2 elements react
Definite propotions
Conservation of mass
Law of multiple proportians
Early 1800s- John
» 5 historical Dalton
principle
» 1.All matter is composed of
extremely small particles called
atoms.
» 2. Atoms of a given element are
identical in size, mass, and other
properties; atoms of different
elements differ in size, mass, and
other properties.'
» 3.Atoms cannot be subdivided,
created or destroyed.
» 4.Atoms of different elements
combine in simple whole-number
ratios to form chemical compounds.
1897- J.J. Thompson
»Verified the existence of
positive particles.
»Was the pudding and plum
guy
»Pudding was positive and
plums were spread throughout
the pudding
»Cathode Ray
1914- Rutherford
»Founded Nucleus with
radioactive study (Gold foil
experiment)
»Protons in the nucleus
» worked under J.J.
Bohr
»Electrons orbit around the
nucleus
»Planetary model
»Protons an neutrons located in
the nuecleous
Chadwick
»Neutrons in the nucleus :)
Definitions :)
Protons- positively
charged elementary
particle, found in
nuclei
Neutrons- elementary
particle having no
charge
Electron- Elementary
particle having
Definitions cont.
»Electron configurationrepresents the 3 dimensions to
space in which a electron
could be found. Described as
four different quantum
numbers
»Orbital diagrams S,P,D,F how
you write to get to your
element
»Atomic Mass Unit- Amu, way to
Definitions cont.
»Grams- way to measure how
much an element weighs
»Moles- Unit of measure to
measure elements on the
periodic table
»Molecules- small particles that
make up living and nonliving
things
Quantum Theory
»Short hand way of writing out
electron configuration
LEQs
»1) Who discovered different
parts of the atom? List all.
»2) How would you write the
electron config. for titanium?
»3) Define the different units of
measurement.
Sample Problems
» Who used the Cathode Ray?
» Who came up with the basic idea of
an atom?
» Draw an orbital diagram of K
» Which of the following is a correct
set of quantum numbers for an
electron in 5 F orbital?
» A. N=5, L=3, Ml=+1,
» B. N=5, L=2, Ml=+3
Answers
»J.J Thomson
»Democrates
»A.
Helpful Websites
»Dictionary.com
»www.colorado.edu/physics/200
0/periodic_table/atomic_mass.
html
»Chemistry.about.com/od/electr
oncicstructuri/a/quantumnum
ber/htm