Covered in these Notes:
Atomic Models
Who made them
Key components
Experiments / Discoveries
Discovery of the electron
Discovery of the nucleus and proton (
Discovery of the neutron (Beryllium Bombardment Experiment)
Different Atoms = Different lights
Shells
Time Line
Outcomes
Describe the basic particles that make up the underlying structure of matter, and
investigate related technologies
● outline the role of evidence in the development of the atomic model
consisting of protons and neutrons (nucleons) and electrons; i.e., Dalton,
Thomson, Rutherford, Bohr
Analyzing and Interpreting: Analyze data and apply mathematical and conceptual
models to
develop and assess possible solutions
● describe and apply classification systems and nomenclature used in the
sciences
● apply and assess alternative theoretical models for interpreting knowledge in
a given field
Covered in these Notes:
● Atomic Models
- Who made them
- Key components
● Experiments / Discoveries
- Discovery of the electron
- Discovery of the nucleus and proton (
- Discovery of the neutron (Beryllium Bombardment Experiment)
- Different Atoms = Different lights
- Shells
● Time Line
, Atomic Models
Models
John Dalton (1766 -1844)
Published comprehensive atomic theory - 1808
→”Billiard Ball” Model
KEY components
● All matter is made of small, indivisible particles called atoms (False)
● All the atoms of an element are identical in properties such as mass
and size (False)
● Atoms of different elements have different properties (True)
● Atoms of different elements can combine in specific fixed rations to
form new substances (True)
J.J. Thomson (1856 -1940)
Discovered the electron (The Cathode Ray experiment)*
→” Raisin Bun” Model
KEY components
● All atoms are made of smaller subatomic particles
- Different combinations of these subatomic particles make
different elements
● An atom is a sphere of positive charge in which negatively charged
particles are embedded.
- Negatively charged particles = Electrons
John Dalton’s Model J.J. Thomson’s model
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