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Module
086

Institution
Third Year / 9th Grade

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Uploaded on June 16, 2024
Number of pages 11
Written in 2023/2024
Type Lecture notes
Professor(s) Joti kholi
Contains All classes

ibstudent
chemistrynotes

Institution Secondary school
Module
086
School year 4

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CHAPTER -4 “STRUCTURE OF ATOM”

CONCEPT DETAILS

KEY CONCEPTS : [ *rating as per the significance of concept]

1. Dalton’s Atomic theory **
2. J J Thomson Experiments ***
3. Rutherford’s Scattering Experiments ********
4. Sub atomic particles ******
5. Atomic number & Mass number *****
6. Neil Bohr’s Atomic Model ***
7. Electronic Configuration & Valency *******
8. Isotopes & Isobars ****

 Pre requisites:
 Difference between an atom & molecule.
 Gram atomic mass & Molar mass.
 Dalton’s Atomic theory.

SURVEY ANALYSIS

Conceptual levels of comprehension on the basis of feedback taken from the students

37

, Contribution to the Atomic theory Timeline

SCIENTIST PROPOSED MODEL OF ATOM

Democritus

Greek philosopher
(400 B.C)

 More than 2400 years ago, he named the smallest piece of matter “ATOMOS ,”
meaning “not to be cut.”
To Democritus,
 Atoms were small, hard particles that were all made of the same material but were
different shapes and sizes.
 Atoms were infinite in number, always moving and capable of joining together

1. Dalton’s Atomic theory:

SCIENTIST PROPOSED ATOMIC MODEL

John Dalton

He proposed the Atomic theory of
English Chemist matter based on his experimental
[proposed atomic theory in 1803] observations.

38

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