INDUCTIVE THINKING MODEL
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Name of School : standard: VIII
Name of Teacher: Suchithra.V.G strength:
Subject: Chemistry date:
Unit : Structure of an atom duration:45 min
Topic: Isotopes and Isobars
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Name of concept : Isotopes
and Isobars
OBJECTIVES
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Pupils develop observation skill
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Identification of isobars and isotopes
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Generalization about isobars and isotopes
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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
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Group A
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Group B
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1H1,1H2,1H3
17Cl35, 17Cl36
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6C14, 7 C14
18Ar40, 20Ca40
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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.
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