Valency in Classification Of Elements- The Periodic Table – Class 10 Science Experiment

Chapter Name: Classification Of Elements- The Periodic Table

Activity Name: Valency in Classification Of Elements- The Periodic Table

Activity Description:

In this activity, students will determine the valencies of the first 20 elements in the periodic table. They will also observe how the valency varies across a period from left to right and how it changes while going down a group.

Required Items:

Periodic table (printout or access to an online resource)

Step by Step Procedure:

1. Introduce the concept of valency to the students and explain its significance in chemical bonding.
2. Provide the students with the periodic table.
3. Instruct them to identify the atomic number and electronic configuration of the first 20 elements (Hydrogen to Calcium).
4. Using the electronic configuration, guide the students to determine the valency of each element based on its group number (number of valence electrons).
5. Record the valencies of all 20 elements in a table or chart.
6. Discuss and analyze how the valency changes in a period as they move from left to right.
7. Also, discuss how the valency varies while going down a group.

Experiment Observations:

• The students will determine the valencies of the first 20 elements and record them in a table or chart. They will observe patterns and trends in the valencies across the period and down the group.

Precautions:

1. Ensure students handle the periodic table with care.
2. Double-check the electronic configurations and valencies to avoid errors.

Lesson Learnt from Experiment:

Through this activity, students will understand the concept of valency and its significance in chemical reactions. They will observe that the valency varies in a period as they move from left to right and remains constant in a group as they move down.