Lesson Notes By Weeks and Term - Senior Secondary 2
Periodic Table
Periodic Table
TERM׃ 1ST TERM
WEEK TWO
Class: Senior Secondary School 2
Age: 16 years
Duration: 40 minutes of 5 periods each
Date:
Subject: Chemistry
Topic: Periodic Table
SPECIFIC OBJECTIVES: At the end of the lesson, pupils should be able to
INSTRUCTIONAL TECHNIQUES: Identification, explanation, questions and answers, demonstration, videos from source
INSTRUCTIONAL MATERIALS: Videos, loud speaker, textbook, pictures
INSTRUCTIONAL PROCEDURES
PERIOD 1-2
|
PRESENTATION |
TEACHER’S ACTIVITY |
STUDENT’S ACTIVITY |
|
STEP 1 INTRODUCTION |
The teacher introduce the periodic table to the students. |
Students pay attention |
|
STEP 2 EXPLANATION |
He explains the families of elements on the periodic table.
|
Students pay attention and participates |
|
STEP 3 DEMONSTRATION |
He discusses the electronic configuration of elements on the periodic table
|
Students pay attention and participate |
|
STEP 4 NOTE TAKING |
The teacher writes a summarized note on the board |
The students copy the note in their books |
NOTE
Periodic Table
The periodic table is a tabular arrangement of chemical elements, organized based on their atomic number, electron configuration, and recurring chemical properties. Elements in the same column share similar characteristics, and the table provides a systematic way to understand the relationships between various elements. It was first proposed by Dmitri Mendeleev in 1869 and has since been refined to its current form.
The periodic law
The periodic law states that the properties of the elements are the periodic function of their atomic numbers. The periodic law gives the physical and chemical properties of elements as the periodic function of the atomic numbers. In simpler terms, elements display recurring patterns in their properties based on their position on the periodic table, and these patterns are determined by the number of protons in their atomic nuclei (atomic number). These periodicity helps organize and predict the behavior of elements.
Metals, Metalloids and Non-metals
The periodic table shows a diagonal division of the elements into metals and non-metals. The metals are found on the left side of the periodic table and the non-metals on the right side. The metalloids occur along the middle.
Electronic configuration and Periodic table
The periodic table is organized into blocks based on the sub-level of the outermost electron. The blocks are s-block, p-block, d-block, and f-block.
Groups 1 and 2 make up the s-block. The elements in this block are the reactive alkali and alkali-earth metals.
Groups 3 to 7 and 0 form the p-block. Electrons are added progressively to the p orbital as we move from Groups 3 to 7 and 0. The elements change from moderately active metals to very active non-metals in Group 7, and finally the nonreactive noble gases in Group 0. Therefore, the s and p block elements are related to the s and p electrons occupying the outermost energy level.
The transition elements occur between Groups 2 and 3 on the periodic table and hence form the d-block.
The lanthanides and the actinides also occur between Groups 2 and 3 in periods 6 and 7 respectively. They form the f-block because they contain f-elements in addition to the s, p, and d electrons.
EVALUATION: - What is the periodic table.
- State the periodic law.
- Discuss the arrangement of elements on the periodic table.
CLASSWORK: As in evaluation
CONCLUSION: The teacher commends the students positively