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atomic structure unit plan for NCERT 9th std

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                          UNIT PLAN
Chapter: Structure of Atom
Unit Questions:
  1. What are the components of an atom?
  2. How the chaos of mass of atom got overcome by scientists?
  3. What are the different models of atom and its limitation and importance?
  4. How electrons are distributed in different orbit and its effect on basic chemical properties?
  5. What is atomic number, mass number, isotopes, isobars and differences between each?

Unit objectives:
Students may able to:
  1. familiarise the structure of atom and its components
  2. understand the life sketch of different scientist
  3. analyse different models of atom
  4. understand about atomic number, mass number, isotopes and isobars
  5. differentiate between different components of atom and its properties
  6. develop a materialistic view about nature

Previous knowledge:
They should know:-
  1. molecules are fundamental building blocks of matter
  2. molecules are made of atoms
  3. concept of molecular mass
  4. compounds and elements, its differences
  5. concept about static electricity and its application in daily life
  6. concepts about planets, solar system etc.

Major Concepts
Major Key questions
Learning Objectives
[Students may able to:-]
Learning Strategy
Learning Resources
Assessment Techniques

Lesson 01

1.1 divisibility of an atom

a) sub atomic particles

1) Are atoms divisible?

2) How scientist assumed that atoms are divisible?
[static electricity]

1) Learn that atom has sub atomic particles are divisible

2) Appreciate the process of assumption about sub atomic particles

3) familiarise the relation between static electricity and atom

1) group discussion
(round robin method)

2) lecture (when ever needed)

3) Questioning

1) Videos related to the discovery.

2) write up, journals related to discovery

1) group assessment

2) work sheet
(objective type)

3)Application cards

1.2 Charge particles in atom

a) Discoveries of  J.J. Thomson and E. Goldstein

b) Proton and electron

1) Why some objects appears to be charged after rubbing with other material?

2) How scientist discovered about sub atomic particles?

3) Why atoms are not charged?

1) familiarise the experiments of J.J Thomson and E.Goldstein

2) understand the electrical neutrality of atom

3) Understand basic properties of proton and electron.

1) group activity

2) inquiry method (based on activity)

1) glass rod, silk cloth, balloon, paper pieces

1) group assessment

2) oral questions

Lesson 02

2.1 Development of structure of atom

2.2 Controversy related to mass of an atom


a) Thomson’s model of an atom

b) Rutherford’s model of atom and his gold foil experiment.

c) Bohr’s model of atom

a) Neutron

a) What is the main contribution of Thomson towards the model of atom?

b) Why Thomson model failed?

a) How Rutherford proposed his model?

b) Why most of the rays passed through the foil?

c) Why he choose thin gold foil?

d) Why some of the alpha particle rebounded?

e)  Why he choose alpha particle and gold foil for the experiment?

f) What was the main contributions of Rutherford’s model of atom

g) How Rutherford failed to explain the stability of atom?

a) How Bohr resolved the problem of stability of atom?

1) How scientist assumed the existence of 3rd particle in atom?

2) How scientist assumed the property of the same?

3) Which particle contributes more to the mass of matter?

a) learn about the model of atom proposed by Thomson

b) analyse the Thomson’s model of an atom

c)draw the Thomson’s model of atom

1) Recognize the purpose of conducting Rutherford’s experiment.

2)  List the main observations made during conduct of Rutherford’s alpha-scattering experiment.

3) understand the conclusions drawn from the observations made during the conduct of  experiment

4) analyse Rutherford’s gold foil experiment

5) understand the drawbacks of Rutherford’s model of atom

6) appreciate the process of experiment

1) understand Bohr’s model of atom

2) draw the Bohr’s model with three shells

3) learn about shells as energy levels

1) Learn that the scientist Chadwick discovered subatomic particle named neutron

2) understand the basic properties of neutron

3) appreciate the process of discovery of neutron

a) lecture cum discussion

b) questioning

c) Assignment [about life of scientist]

d) group discussion

1) questioning

2) lecture cum discussion

a) charts showing different models of atom and Rutherford’s gold foil experiment

b) videos and animations related to Rutherford’s gold foil experiment

c) flip charts/ power point presentations about different scientists and their life

1) Write up, journals related to discovery

2) videos about Chadwick’s discovery

1) work sheet
(cross words and objective questions)

2) oral questions

3) assessment of

4) group assessment

5) One-sentence summary

1) oral questions

2.2 difference between models of atom and significance of each

a) Difference between Thomson’s, Rutherford’s and Bohr’s model.

b) significance of Rutherford’s gold foil experiment

c) Significance of Bohr’s model in representing atom.

1) Why Bohr’s model is still appreciated in representing atom?

2) In what way Bohr’s model is superior to Rutherford’s model?

1) list out the difference between Thomson’s, Rutherford’s and Bohr’s model

2) Realise the historical significance of Rutherford’s

3) understand importance of Bohr’s model in representing atom

4) appreciate Bohr’s model in representing atom

1) think-pair-share

2) questioning

a) ppt showing differences of each model.

a)  group assessment

b) wok sheet
 (objective type)

Lesson 03

3.1 electronic configuration and shells

a) different shells and patterns of distribution in shells

b) different patterns of electronic configuration [first 18 elements of periodic table]

1) How each atom is different from others?

2) What are the patterns of distributing electron?

3) Why patterns of distribution of electron exist?

1) Learn about the maximum number of electrons present in a shell of an atom.

2)  Learn about maximum number of electrons which can be accommodated in the outermost Shell of an atom.

3) Draw the electronic configuration of an atom

4) State the number of protons, neurons and electrons, number of shells of different atom

5) Know that the shells in an atom are filled in stepwise manner.

1) Role Play (Individual)

2) group activity
(models of first 18 elements)

1) charts(showing  electronic configuration of different elements)

2) models (of first 18 elements)

1) rubric (for role play)

2) work sheet

3) group assessment

3.2 Valence electrons and Valency

a) difference between Valency and valence electrons

b) Valency of  different elements
[first 18 elements of periodic table]

c) reactivity and its relation with Valency

a) Why Valency is different in different atoms?

b) How Valency effect the capacity of combining of atom?

1)  State Valency of different atom

2) Understand the relation between Valency and reactivity.

3) find Valency of different elements from number of electrons

4) understand difference between Valency and valence electrons

a) group assignment (on Valency of different atoms and its consequences)

b) lecture (when needed)

a) models of atom

b) board

a)  work sheet

b) group assessment

Lesson 04

4.1 atomic number mass number.

4.2 isotopes and isobars

a) Meaning and atomic number and mass number of different elements.

b)  Difference between atomic and mass number.

c) Representation of both in notation for an atom.

a) meaning of isotopes and isobar

b) difference between them

c) isotopes of hydrogen and other elements; their difference in atomic structure

d) isobars of different element and their difference in atomic structure

e) elements are defined by no of protons

a) Why mass number is different in different atoms?

b) What factors influences atomic number and mass number?

c) How atomic number differs from mass number?

a) How isotopes is different from isobars

b) Are isotopes having same property? Why?

c) how we can make use of isotopes?

1) learn atomic number of different elements

2) calculate involving mass number, atomic number, number of electrons

3) differentiate between atomic number and mass number

4) Represent of both in notation for an atom.

1) learn isotopes and isobars

2) differentiate between isobars and isotopes

3) List out properties of isotopes and isobars.

4) understand a new concept about elements and its no of protons

1)  activity followed by presentation (of different notations; in pairs)

2) activity (write around method)

1) group discussion
(tea party method)

3) questioning

3) lecture when needed

a) board

b) models of atom

c) video (series provided by Gyan Darshan or any other regional educational channel)

1) board

1) rubrics(assessment of individual activity)

2) oral questions

3) Chain Notes (including problems)

a) group assessment

b) oral question

c) work sheet
(objective type)


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