A LESSON PLAN

A LESSON PLAN

INDUCTIVE THINKING MODEL

Name of School : standard: VIII Name of Teacher: Nayana Nirmal. S strength: Subject: Chemistry date: Unit : Structure of an atom duration:45 min Topic: Isotopes and Isobars

Name of concept : Isotopes and Isobars

OBJECTIVES

· Pupils develop observation skill

· Identification of isobars and isotopes

· Generalization about isobars and isotopes

· Pupil develop hypothesizing predicting results

PHASE 1: DATA CATEGORISATION

T : What is the common property of ₉₂U²³⁵,₉₂U²³⁸, ₁₈Ar⁴⁰,₂₀Ca⁴⁰, etc?

S : They all are elements.

T : can you name some elements having same mass number or atomic number

S : ₁H¹,₁H²,₁H³,₁₇Cl³⁵,₁₇Cl³⁶,₆C¹⁴,₇N¹⁴

T : Can you group these examples and name them according to their similarity

Group A	Group B
1H1,1H2,1H3 17Cl35, 17Cl36	6C14, 7 C14 18Ar40, 20Ca40

PHASE 2 : INTERPRETATION OF DATA

T: Let me analyze each group of example and know more about them what is the peculiarity of elements in group A?

S : They all have same atomic number.

T : Anything else?

S : Mass number of each pair is different.

T : Yes. You are right. They are called isotopes. what about group B?

S : Group B elements have same mass number

T : Is their atomic number equal?

S : No teacher.

T: Ok. They are called isobars. Isotopes are different forms of same elements. Their mass number will be different .elements having same mass number and different atomic numbers are called isobars. Isobars are of different elements.

PHASE 3 : APPLICATION OF GENERALISATION

T: Now I will give you examples of isotopes and isobars. You must name its type.

_6C¹⁴,₆C¹²

S: Isotope

T: Why it is called isotope?

S: Their atomic number is equal but mass number is different.

T: yes. Now ₆C¹⁴&₇N¹⁴

S: it is isobar.

T: why you called it as isobar

S: Because they have same mass number but different atomic number.

T:₁H¹,₁H²,₁H³

S: Isotope

T: ₈O¹⁵,₇N¹⁵

S: Isobar

T: yes. So isotopes have same atomic number and different mass number and isobars have same mass number but different atomic number.