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Find out the answers by analyzing the periodic table

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1.How many periods are there in the periodic table?

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2.How many groups are there in the periodic table?

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3.The shortest period is ------.

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4.The number of elements in the third period -------.

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5.Is it possible to find the groups and periods of an element if electronic configuration is given?

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Starter

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Electronic configuration and position in the periodic table

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Phase-1

Complete the activity card given by analysing the table below.

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🡺Chemical properties of elements depend on the number of electrons present in their outermost shell.

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🡺Hence the elements present in the same group exhibit similarity in the chemical properties.

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🡺What is the relationship between electronic configuration and chemical properties?

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Phase-2

  • Group-1 Elements
  • Group-2 Elements

The group number is the number of electrons present in the outermost shell for the elements in groups 1 and 2.

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1.Symbols of certain elements are given. Write their electronic configuration and group to which they belong.

      • 12Mg , 6C, 17Cl

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Phase-3

  • Observe the electronic configuration of second period elements from group 13 to 18.

10

10

10

10

10

10

  • Based on the common characteristics of elements in each group they can be grouped as different families.

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The group number of these elements by adding 10 to the number of electrons in the outermost shell.

Based on the common characteristics of elements in each group they can be grouped as different families.

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1.Find the elements in the same group

      • 11Na , 4Be, 6C,3Li

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Concluding Activity

Elements

Atomic Number

Electronic Configuration

Group Number

Period Number

Lithium

…

2,1

1

2

Oxygen

8

…

…

…

Argon

18

….

…

…

Calcium

…

2,8,8,2

…

…

Fill in the blanks with the correct answers in the chart provided

16

2,6

3

2

2,8,8

18

3

20

2

4

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Consolidation and Review

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  • Chemical properties of elements depend on the number of electrons present in their outermost shell.

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  • Hence the elements present in the same group exhibit similarity in the chemical properties.

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  • The group number is the number of electrons present in the outermost shell for the elements in groups 1 and 2.

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  • The number of shells in an element and the number of the period to which it belongs are the same.

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Review

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  1. What is the relation between group number and electronic configuration of group 1 and 2 ?

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The group number is the number of electrons present in the outermost shell for the elements in groups 1 and 2.

NEXT QUESTION

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Review

  • How can we find the group number of 13 to 18?

NEXT QUESTION

The group number is the number of electrons present in the outermost shell for the elements in groups 1 and 2.

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Review

  • What is the relation between electronic configuration and period number?

FINISH

The group number is the number of electrons present in the outermost shell for the elements in groups 1 and 2.

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Follow up Activities

  • Electronic configuration of elements P, Q, R and S are given below. (Symbols not real)

P - 2,2

Q - 2,8,2

R - 2,8,5

S - 2,8,1

  1. Which among these elements are included in the same period?
  2. Which are those included in the same group?
  3. Which among them is an alkali metal?
  4. To which group and period does the element Q belong?